An Anemometer is used to measure air speed with some versions also measuring air flow. There are different types of anemometers depending on how you are planning to use them and your application. If you want to measure wind speed outside and you are not concerned about wind direction then a Cup anemometer would be the meter you are looking for. Vane and mini vane anemometers must be held in the direction the wind is coming from to get the most accurate reading possible, these units are used both inside and outside and can measure a wide variety of air speeds. To measure very low airspeeds a hot wire anemometer is best suited to your application, these units are extremely precise and work wonderfully at low air speeds, they are quite delicate however so care must be taken not to damage the sensor when using them.
Air flow meters can determine the air flow, which is the volume of air not just the speed of the air; these are extremely useful in HVACR applications. When taking air flow measurements the accuracy of your results will be greatly increased when using an Air Flow Hood which is used to capture all the air flowing from an outlet.
We also have available wind data loggers for recording the air speed over time; this can be used to assess the amount of wind an outside site is exposed to over a long term basis. This data is saved and then graphed to your computer for further analysis. Another way of measuring outside air speed and direction is by using one of our weather stations, these can also be used to record a number of different weather parameters giving you a versatile weather recording option.
As their name suggests Chlorine Meters measure the chlorine content of liquids. Most of our units also measure a number of different parameters including pH, temperature and ORP, this gives you a very diverse water quality tool. As with most water quality meters, chlorine meters should be calibrated to ensure you get a long life and the most accurate results possible from your meter.
If you are purely after a meter which measures chlorine then our CL200 meter is a great option, it is extremely accurate and fast to use, this is one of our most popular chlorine meters. Our EX900 meter is one of our most diverse units, it is small, durable and very easy to use which is exactly what you want when out in the field.
Colorimeters are used in the analysis of water quality and have many different uses including testing swimming pool water, spas, public utilities, industrial waters water, treated water, water conditioning systems and paper & pulp mills etc. Different colorimeters can measure different combinations of chemicals found in water, so not every meter suits all applications. It is best to ask one of our Customer Service Representatives to guide you in the right direction.
The meters can measure a variety of chemicals including (but not limited) to Bromine, Chlorine, Chlorine Dioxide, Ozone, Cyanuric Acid and pH. As with most water quality meters it is extremely important to calibrate your unit before each use using a dedicated calibration solution which you will find in the accessories tab of each meter, this ensures that your meter is always giving you the most accurate results possible.
Conductivity, TDS and Salinity are different water quality parameters which can all be measured by the same conductivity meter depending on the model. Conductivity meters work by using electrical conductivity to measure the quantity of ions in an aqueous solution, the more ions the more conductive the solution is. The temperature of the liquid you are testing can also affect how your meter reads the conductivity of the solution, it is therefore important to buy a meter which has Automatic Temperature Compensation of ATC, this means that the meter will automatically cancel out the affects of temperature on your readings giving you a consistent result.
Conductivity meters come as handheld pen testers, handheld meters and bench meters. When selecting the conductivity meter you need, ensure that it will measure the correct range that you need to measure and that it has the accuracy and resolution you need. For use in the field you may want to consider the waterproof units available for a more robust option and as always with water quality meters a relevant calibration and storage solution is a must to ensure a long working life for you unit.
Dial Analogue thermometers are an aesthetically please way to monitor and display the air temperature in the home or office environment. Our customers often buy these units as gifts as they look great in any room, veranda, deck or boat. However analogue meters are not as accurate as digital meters as you have a degree of human error in reading the temperature off of the dial. This is not generally a problem when they are being used around the home, but it is something to consider when purchasing a unit.
Many analogue thermometers are also able to measure and display humidity which means the units not only look good but are also more versatile.
A Dissolved Oxygen Meter measures the amount of dissolved gaseous oxygen in a solution, both nitrogen and oxygen will just dissolve in water without chemically reacting to it and they exist as microscopic bubbles in-between the water molecules. There are a number of different types of DO Meters including handheld, bench type and waterproof options, you need to consider which type is best suited to your particular application. Many different industries use DO meters including aquariums, medical research, agriculture, laboratories, paper processing, sewage treatment, mining etc. Regardless of the industry you are from or the type of meter you purchase it is very important to regularly use calibration solution with your meter to ensure you receive the most accurate results possible.
When using a dissolved oxygen meter you must be aware that the dissolved oxygen is affected and varies with temperature (the higher the temperature the lower the DO), the salinity (the higher the salinity the lower the DO) and atmospheric pressure (the lower the atmospheric pressure the lower the DO). Some selected DO meters can compensate for these variables, if you are unsure about any of these variables then you can call us on 1300 737 871 for help selecting the best option for you.
From flammable gas to carbon dioxide and carbon monoxide, gas meters and detectors are a very important part of workplace OH&S, they are used across a broad range of industries from mining, manufacturing to HVACR.
Many of the gas detectors have an audible and visual alarm which sounds when a hazardous gas is detected; these meters are an essential component of PPE in high risk places.
Different detectors can test for different gasses, it is important to make sure you research which gasses you need to be testing for before you purchase a unit. If you know what gasses you want to test for then you can buy a multi-function unit which can detect them all.
By measuring the heat stress you can get a clear picture of how environmental factors lead to heat stress and enable you to help avoid heat exhaustion in public health, sports, military and industrial activities.
Humidity Meters measure the amount of water vapour present in the air, this is usually represented as a percentage known as relative humidity (%RH). We have many different types of humidity meters which suit many different applications. Meters with handheld external probes are great for measuring in tight hard to reach places, meters with a large easy to read display are great for use in offices or rooms where you want to glance at the meter and read the humidity easily. You can also get humidity meters with alarms which will let you know when the humidity has gone outside a pre determined range, and if you would like to monitor the humidity over time then we have a range of humidity loggers which will allow you to do this.
Some humidity meters will also measure Dew point. Dew point is the temperature point which air needs to be cooled at a constant pressure for water vapour to condense (and form dew). A Psychrometer is a meter that will measure Wet bulb and dry bulb temperature allowing you to either calculate relative humidity or a digital version will calculate this for you.
An Infrared Thermometers (IR Thermometers) are also known as Non-Contact or Laser Thermometers. They can be pointed at the surface of an object and they will measure the temperature of the surface by measuring Infrared light emitted from the object. They are a great tool allowing you to measure the temperature at a distance from the object you want to measure.
You will see the term ‘the distance to spot ratio’ used a lot when reading about IR thermometers. It is a ratio of the distance you are from the surface you want to measure, related to the size of the area you will be measuring. For example, an IR thermometer with a 1:1 spot ratio will measure the average temperature on a surface with an area with diameter of 1m at a distance of 1m. The distance to spot ratio is important when considering how accurate you need your meter to be, in general the larger the spot ratio, the more accurate the meter is as it focuses on a smaller spot on the objects surface. It is also important to consider the type of object you will be measuring; is it shiny and reflective? If your object is shiny and reflective then this could interfere with the reading you get from your IR Thermometer, the duller and darker the object the easy it is to get an accurate temperature reading, if you are in doubt about whether a non-contact thermometer is suitable for your application then feel free to call and talk to one of our qualified scientists.
A light meter is used to measure the amount of light in your location. Our standard light meters measure light in Lux, lumens and/or foot candles, the UV light meters (which measure UV light) measure in uW/cm2.
Light meters have a wide variety of applications but are used mainly to determine if there is enough light in certain situations. For occupational health & safety they are used to check the light levels in a workplace and councils use light meters to check if street lighting is adequate. Manufacturers of lighting equipment will use light meters to test the level of light coming from their products. Animal researchers also use light meters to test the light levels in breeding areas and habitats.
To detect moisture levels in materials you need a moisture meter, these meters will give you a reading of how much moisture is present. The general meters are used in building materials, including wood, concrete, plasterboard and masonry. The soil moisture meters can be used in the ground in gardens, on farms and on building sites. The Grain/Hay meters will give you a reading of the moisture present within the grain or hay easily.
For the general building material type moisture meters there are pin type meters and non-destructive meters (and combined). The pin type meters will give you a reading of the moisture between the two pins, ideally the pins should be pushed into the material being tested. The non-destructive meters are held against the material and with a signal they test moisture levels below the surface.
Typically for measuring moisture in air you would use a humidity (or RH) meter, there is another category on our website for these type of meters.
ORP or Oxidation Reduction Potential meters are similar to pH meters but require a different sensor and the measurement is in mV. Some pH meters however will allow you to measure ORP when used with an optional specialised ORP probe.
ORP is a measure of the cleanliness of the water & the ability of the water to break down contaminants. ORP meters are often used in swimming pool water, pulp bleaching, cooling towers, aquaculture, drinking water testing and processing.
pH is a measure of the acidity or alkalinity of a substance. pH meters will typically measure the pH of a liquid, but with a specialised probe they can also measure surfaces, and in semi-solids such as cheese and soil.
pH meters will need calibration on an ongoing basis to ensure they are always reading correctly. pH Buffer solutions are liquids of a known pH that can be used to test and calibrate the meter. pH 7.0 (neutral) is the most common buffer solution to start with and then pH 4.01 and pH 10.01 allow you to calibrate for more acidic and basic measurement applications. Other buffer solution standards are available on request for specific applications.
The pH electrodes (the sensor part of the meter) need to be treated with care, they are often fragile and need to be kept clean and moist when not in use.
Meters which give you readings of wet bulb and dry bulb temperatures along with humidity.
Typically a psychrometer consists of two thermometers, one with a dry bulb and one with a wet bulb. The electronic versions of these are able to measure the wet bulb temperature without having moisture present, making it a much more straight forward measurement, the electronic versions will typically give you a RH% (humidity) value as well.
Hand held meters, data loggers and fixed displays for measuring and recording sound levels in dB. Monitoring sound levels is important for occupational health and safety as well as in situations where your equipment, music or crowds of people can be too loud.
Sound level meters are generally described as Class 1 or Class 2. Class 1 sound meters have a tighter tolerance to error and a wider frequency range than class 2 meters. For most applications a Type 2 meter is suitable. We also have personal dosimeters available to monitor the sound levels experienced by a person on site, these are attached to a person's clothing and will record the dB levels reached over time.
The Sound level data loggers allow you to have the meter left on location to measure and record the fluctuations in sound level over time. This data can then be downloaded to your computer for graphing and analysis.
A broad selection of temperature meters are available including basic stem thermometers, IR thermometers, fridge freezer thermometers, wireless thermometers along with RTD and thermocouple probe thermometers. The meters will measure temperature in Celsius and Fahrenheit.
Our most popular are the stem thermometers and fridge/freezer thermometers, they are used in applications ranging from cooking, to laboratory, to temperature sensitive transport applications.
The IR thermometers allow you to measure the temperature of an object without touching, you just point and shoot at the object and the meter gives you an instant reading.
Different sensors are available for the thermocouple thermometers, you need to be careful on the type of sensor to use with each meter, please call 1300 737 871 for advice on the best sensor for your application.
Unlike normal cameras which take pictures of visible light, thermal cameras (or infrared thermal cameras) take pictures of invisible infrared radiation. You will commonly experience infrared radiation as heat. This means that thermal cameras can be used to take images which show how much thermal energy or heat an object is emitting.
As thermal cameras can take images of things that would be invisible to the normal eye, they can be used for a wide variety of different applications. These include buildings and pest inspections, preventative maintenance, medical and veterinary checks along with research and development.
Thermal cameras can be used very effectively in situations where infrared thermometers (temperature guns) have had limited success in the past. This is because standard infrared thermometer take an average reading over a large area, their accuracy is thus limited and you run the risk of missing small hot spots. An infrared thermometer will allow you to measure one spot at a time, whereas even an entry level thermal imaging camera will allow you to see 3,600 points at a time, capturing all the information you need without missing a thing.
Turbidity is a measure of the haziness or cloudiness (caused by suspended solids (particles)) of a liquid. By inserting a liquid sample in a turbidity meter you can get a quick and easy reading of the turbidity levels.
Turbidity can indicate the presence of pathogens, bacteria and particles that can shelter potentially harmful organisms from disinfection processes. Turbidity meters are used to measure turbidity in lakes, streams, rivers and estuaries as well is in water treatment applications.
Calibration standards are used to ensure the meter is calibrated and is working correctly, these are supplied with the kits but will need replacing over time to ensure accurate results.
Get a clear indication of the weather in your location. Weather Stations are instruments used to measure atmospheric conditions including temperature, humidity, rainfall, wind speed/direction, barometric pressure plus more, depending on the station.
A home user might just have an interest in the weather and would love to know the conditions at their house. But a professional user may have to meet certain regulations or run experiments in specific locations.
A basic weather station great for a home user starts with a measuring temperature and humidity along with barometric pressure. For more measurements you may like to look at a station which also measures precipitation (rainfall), wind speed and wind direction.
For companies and organisations who need to measure weather parameters, our professional range of weather stations have improved accuracy and long term performance.
Applications for the entire range of weather stations include home, farming/agriculture, mines, civil engineering, defence, research, road construction along with OH&S.
Data logging weather stations are available to record information over time and some options will allow you to upload the information to the internet for remote observations. With tripod and mounting accessories available along with solar panels for remote setups Instrument Choice has an option to suit you.
Call our weather station experts on 1300 737 871 to help you get the best weather station for your requirements.
For years our customers have been asking for wind direction along with wind speed. New for 2007, the Kestrel 4500 does just that with its built in digital compass. But it doesn’t stop there. It also calculates crosswind and headwind/tailwind with reference to a user-set target heading, and stores the information along with all the other environmental readings in its 1400 data point memory.
Pair the 4500 Wind Meter with the Kestrel Vane Mount and you have a data-logging weather station that sets up in seconds and rotates in the slightest of breezes. Did we mention that the whole kit is the ultimate in portability? It packs down into a 2 x 6 inch pouch and weighs under 8 ounces.
Also available in the NV Configuration
Military personnel and pilots flying in darkness are often concerned with preserving their night vision. Due to overwhelming demand from our military customers, the Kestrel NV line was added in 2005.
The Kestrel 4500NV has a night-vision preserving backlight which helps users to sustain natural night vision. The NV's backlight incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. Additionally, NV backlights are also much dimmer than a standard backlight, making it more difficult to detect with the naked eye in night operations. This backlight appears soft greyish pink, not red, and is still in the visible spectrum, so is not compatible with night-vision equipment.
It takes 30 to 45 minutes for the average eye to adapt to darkness and maximize night vision. Even a short burst of white, yellow, green or blue light “bleaches out” the rod cell photoreceptors in the eye and causes night blindness until the entire adaptation process can take place again. Light in the red spectrum does not cause this “bleaching out”, preventing night blindness and night vision fatigue.
Kestrel 4500 Measures
* Heading (true & magnetic)
* Wind direction
* Pressure trend
* Barometric pressure
* Wet bulb temperature
* Relative humidity in %
Heat stress index
* Wet bulb temperature
* Density altitude
* Wind chill
* Air, water, and snow temperature °F or °C
* Current, average, and maximum air velocity
Kestrel 4500 Features
* Waterproof and floats
* Time and date
* Easy- to-read backlit display
* Data Logger (automatic and manual)
* Customizable data storage - 1400 data points
* Minimum, Maximum and Average values
* Multi-Function 3-line display
* Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
* Exterior temperature, humidity, and pressure sensors for fast and accurate readings
* Customize screens to display user-selected measurements
* Graph and recall trends
* User-replaceable impeller
* Flip-top impeller cover allows use of other functions while protecting the impeller
* Data charting
* Upload to a computer (with optional interface)
* Five languages (English, French, Spanish, German, and Italian)
* US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
* 5-year warranty
* Assembled in the USA
* The Kestrel-4500-BT comes with Bluetooth connectivity to download data to your computer. Your computer must have a Bluetooth connection or purchase an additional USB Adaptor.
0.4 to 60.0 m/s
0.4 to 40.0 m/s
59 to 11,948 ft/min
59 to 7877 ft/min
1.0 to 218.0 km/h
Larger of 3% of reading or least significant digit
1.0 to 144.0 km/h
0.8 to 135.0 mph
0.8 to 89.0 mph
0.6 to 118.3 kt
0.6 to 78.0 kt
0 to 12 B
0 to 12 B
1 inch diameter impeller with precision axle and sapphire bearings. Off-axis accuracy -1% @ 5º off-axis; -2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH / 7 m/s. Sustained operation above 60 MPH / 27 m/s will wear impeller rapidly and may cause destruction of impeller. Replacement impeller (NK PN-0801) may be field-installed without tools (US Patent 5,783,753).
Wind Direction / Forward Heading
0 to 360°
0 to 360°
2-axis solid-state magnetoresistive sensor mounted perpendicular to unit plane to permit operation while measuring wind speed. Declination/variation adjustable for True North readout. Accuracy of measurements dependent upon unit's vertical position. Self-calibration routine eliminates magnetic error from batteries or unit and must be run after every full power-down (battery removal or change).
-49.0 to 257.0 °F
-20.0 to 158.0 °F
-45.0 to 125.0 °C
-29.0 to 70.0 °C
Measures air, water and snow temperature. Thermally isolated, hermetically sealed, precision thermistor mounted externally (US Patent 5,939,645). Calibration drift negligible.
0.0 to 100.0 %
5.0 to 95.0 % non-condensing
Polymer capacitive humidity sensor mounted in thin-walled chamber external to case for rapid, accurate response (US Patent 6,257,074). (To achieve stated relative humidity accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and must be kept out of direct sunlight.) Calibration drift +/- 2% over 24 months. Relative humidity may be recalibrated at factory or in field using Kestrel Humidity Calibration Kit (NK PN-0802).
(mb & PSI 4000 model only)
0.3 to 32.5 inHg
At 77.0 °F, 22.1 to 32.5 inHg
hPa / mb
10.0 to 1100.0 hPa / mb
1.5 hPa / mb
At 25.0 °C, 750 to 1100 hPa / mb
0.15 to 16.0 PSI
At 77.0 °F, 10.9 to 16.0 PSI
Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Maximum error over temperature range 32 to 158 °F (0 to 70°C) , +/- 0.06 inHg / +/-2.0 hPa. Calibration drift typically -0.03 inHg / -1.0 hPa per year. Pressure sensor may be recalibrated at factory or in field.
-6000 to 30000 ft
At 77.0 °F, <19,700 ft. Max error +/- 98 ft
-2000 to 9000 m
At 25.0 °C, <6,000 m. Max error +/- 30 m
Temperature compensated pressure (barometric) altimeter.
0.8 to 135.0 mph
8.5 to 89.0 mph
59 to 11,880 ft/min
750 to 7832 ft/min
1.0 to 217.3 km/h
13.7 to 143.2 km/h
0.4 to 60.0 m/s
3.8 to 40.0 m/s
0.6 to 117.3 kt
7.4 to 77.0 kt
Calculated from the primary measurements of wind speed, wind direction and target heading. Auto-switching headwind/tailwind indication. Ranges expressed refer to primarywind speed.
0.7 to 135.0 MPH, -49.0 to 257.0 °F
1.8 to 89.0 mph, -50.0 to 50.0 °F
0.4 to 60.0 m/s, -45.0 to 125.0 °C
0.4 to 40 m/s, -45.6 to 10.0 °C
Calculated from the primary measurements of wind speed and temperature. Utilizes the NWS Wind Chill Temperature (WCT) Index, revised 2001, with wind speed adjusted by a factor of 1.5 to yield equivalent results to wind speed measured at 10 m above ground. (Specification temperature limits established by WCT Tables.)
0.0 to 100.0 %RH, -49.0 to 257.0 °F
70.0 to 130.0 °F, 0 to 100% RH
0.0 to 100.0 %RH, -45.0 to 125.0 °C
21.1 to 54.4 °C, 0 to 100 %RH
Calculated from the primary measurements of temperature and relative humidity. Utilizes the NWS Heat Index (HI) tables. (Specification temperature limits established by HI tables.)
0.0 to 100.0 %RH, -49.0 to 257.0 °F
-20.0 to 158.0 °F, 20.0 to 95.0% RH
-29.0 to 70.0 °C, 20.0 to 95.0 %RH
0.0 to 100.0 %RH, -49.0 to 257.0 °F
-20.0 to 158.0 °F, 20.0 to 95.0% RH
0.0 to 100.0 %RH, -45.0 to 125.0 °C
-29.0 to 70.0 °C, 20.0 to 95.0 %RH
Calculated from the primary measurements of temperature and relative humidity. Temperature to which the air would need to be cooled at a constant pressure to become saturated.
Wet Bulb Temperature
-49.0 to 257.0 °F, 0.0 to 100.0 %RH, 8.86 to 32.48 inHg
32.0 to 100.0 °F, 5.0 to 95.0% RH, 8.86 to 32.48 inHg, <19700 ft
-45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa
0.0 to 37.8 °C, 5.0 to 95.0 %RH, -2000.0 to 9000.0 hPa, <6000 m
Calculated from the primary measurements of temperature, relative humidity and pressure. Temperature indicated by a wet bulb psychrometer.
-49.0 to 257.0 °F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg
32.0 to 100.0 °F, 5.0 to 95.0 %RH, 8.86 to 32.48 inHg, <19700 ft
-45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa
0.0 - 37.8 °C, 5.0 to 95.0 %RH, -2000 to 9000 hPa, <6000 m
Calculated from the primary measurements of temperature, relative humidity and pressure. Air density converted to equivalent sea level elevation at the International Standard Atmosphere.
One-button clear and restart of Max Wind Gust and Average Wind measurement.
Data Storage / Display
Minimum, maximum, average and logged history stored and displayed for every measured value. 2900-point data logger with graphical display. Auto data storage; interval settable from 2 seconds to 12 hours. Manual data capture.
Requires optional PC interface (NK PN-0830) and provided software. RS-232 connection with USB adapter available.
Choice of aviation green or visible red electroluminescent backlight. Automatic or manual activation.
Clock / Calendar
Real-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment.
Operational Temperature Range
(LCD and Batteries)
The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Beyond the limits of the operational temperature range, the unit must be maintained within range and exposed for minimum time necessary to take reading.
-22 °F to 140 °F / -30 °C to 60 °C.
User-selectable: 15 or 60 minutes with no key presses or disabled.
English, French, German, Italian, Spanish.
CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).
AAA Alkaline, two, included. Average life, 400 hours of use, +/-depending on backlight use.
Waterproof (IP67 standard). Drop-tested (MIL.STD.810F; unit only. Substantial impact may damage replaceable impeller.).
Unit 5.0 x 1.8 x 1.1 in / 12.7 x 4.5 x 2.8 cm.
Unit 3.6 oz / 102 g.
Kestrel Meters are designed and manufactured at NK’s facility in Boothwyn, Pennsylvania, and are individually calibrated at the time of manufacture. Every Kestrel Meter comes with a Certificate of Conformity to document the unit’s accuracy—all Kestrel measurements are traceable to the National Institute of Standards and Technology, ensuring the highest level of reliability.
Warranty: 5 Years
Data logging with the Kestrel
How to set reference barometric pressure
Downloading data from Kestrel Pocket Weather Tracker
The Kestrel Portable Vane Mount is an ingeniously simple accessory designed for extreme light weight and portability. The precision pivot and lightweight vane extension allows the unit to spin freely in the slightest of breezes.
FREE STANDARD POST FOR ITEMS MARKED BULKY or BATTERIES 2 to 5 working day delivery time
NOTE FOR BATTERY RANGE OF PRODUCTS - Items from the Battery Catalogue ship by Free Standard Post and leave our store within 4 days from ordering.
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Orders placed before 2pm (EST) Mon-Fri will be processed that day and in stock items shipped that day. After 2pm your order will be head of the queue to ship the next working day. If you have any questions call 1300 737 871.
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Handheld and fixed instruments for testing the environment around you. Including wind meters, thermometers, sound meters, water quality testing systems and weather stations.
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