HM Digital Handheld TDS Meter W/ Thermometer

Features Ideal for commercial use. Includes a carrying case with belt clip. Highly efficient and accurate due to its advanced microprocessor technology. Hold function saves measurements for convenient reading and recording. The meter shuts off automatically after 10 minutes of non-use to conserve batteries. Measurement range is 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm. From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking ' x10' image. Built-in digital thermometer Large and easy-to-read LCD screen. Calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. Specifications TDS Range: 0 - 9990 ppm ( mg/ L) Temp. Range: 0 - 80 degrees Celsius Resolution: 1 ppm, 1 degree Celsius ( also available in 10 ppm) Accuracy: + / - 2% Conversion Factor: NaCl ( avg. 0.5) ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius ( 33 to 122 degrees Fahrenheit) Power source: 2 x 1.5V button cell batteries ( included) ( 357A) Battery life: 1000 hours of usage Dimensions: 15.5 x 3.1 x 2.3cm ( 6.1 x 1.25 x 1 inches) Weight with case: 76.5g ( 2.7 oz) Weight without case: 56.7g ( 2 oz) TDS & EC Calibration HM Digital meters come factory calibrated ( at 342 PPM or 1413 µ S, depending on the product) and are ready to use out of the box. They are designed to stay consistent. However, after prolonged usage, it may help to recalibrate your meter using a commercial standard NaCl-based solution ( for most HM Digital meters) , which is approximately, 0.5 µ S of conductivity. Immerse the meter into the calibration solution. If the meter does not read within 2% of the calibration solution, adjust the reading by either digital calibration ( for some products) or inserting a mini screwdriver ( not included) into the trimmer pot ( the hole on the back of the meter) . Turn the trimmer clockwise to increase the reading and counterclockwise to decrease the reading. Note that the adjuster is very sensitive. Always refer to the calibration instructions for your particular product. Note: HM Digital products are calibrated with a 342 PPM NaCl or 1413 µ S solution. This is suitable for most applications. However, if you are measuring samples that are consistently over 1000 PPM, it is recommended to recalibrate the meter for that specific application. TDS meters are more accurate when calibrated at levels that are as close as possible to the sample being tested ( such as for hydroponics, aquaculture, tinting and dying or brackish water) .