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Hanna Instruments PRIMO TDS Tester with Batteries, 0 to 1999 ppm, 1 ppm Resolution, +/-2% Accuracy, 0 to 60 Degree C. The Primo series of testers provide a fast and dependable way to measure the total dissolved solids or conductivity in your water samples. It is ideally suited for the rigorous demands of water quality professionals. Many professionals use the cabled version of the Primo when demonstrating the before and after results of conditioning and filtration systems. Temperature is compensated automatically to ensure the readings are consistent to the standard or reference temperature. Operating and routine maintenance has never been easier. Primo uses a single button at the top of the meter. Press it once and the meter is powered and ready for use. Press and hold the button for a few seconds and Primo automatically enters calibration mode. Simply open a sachet of calibration solution, dip the probe in, and within seconds the meter recognizes the calibration solution and calibrates itself. Range: 0 to 1999 ppm ( milligrams per liter). Resolution: 1 ppm ( milligrams per liter). Accuracy: +/-2 percent F.S. Calibration solution: HI 70032P. Calibration: automatic, at 1382 ppm. Temperature compensation : automatic, 0 to 60 degree C (32 to 140 degree F), beta=2 percent / degree C. Battery Type / Life: 2 by 1.5V / approx. 200 hours; auto-off after 5 minutes of non-use. Environment: 0 to 50 degree C (32 to 122 degree F); RH max 95 percent. Measures 7-3/32′ length by 2′ width by 1′ height. 115 g (4.1 oz). Hanna Instruments PRIMO TDS Tester with Batteries, 0 to 1999 ppm, 1 ppm Resolution, +/-2% Accuracy, 0 to 60 Degree C