Water contains a variety of minerals and salts, such as carbonates, bicarbonates, chlorides and nitrates. TDS (Total Dissolved Solids) is the parameter measuring the total sum of all these compounds. The TDS1 Total Dissolved Solids Meter is the ideal tool for all water treatment applications including softening, demineralization, reverse osmosis, drinking water as well as fish farming, aquariums, pollution control, swimming pools and colloidal silver. The TDS1 Total Dissolved Solids Meter is a reliable tester that gives you quick, accurate readings of TDS. Simply take a sample of your solution and dip the unit anywhere between 1/2” and 1” into the solution. simple, quick, no fuss and no need to fill, empty and clean cups! The TDS1Total Dissolved Solids Meter is specifically designed to accurately measure low TDS levels with 1 ppm resolution and ﾱ10 ppm accuracy from 0 to 999 ppm. ATC. Temperature effects your TDS measurements by a factor of 2% per degree centigrade. Automatic Temperature Compensation (ATC) assures that all readings are compensated for temperature variations. Recalibration. If calibration is necessary simply submerge the electrodes into a calibration solution and turn the trimmer under the battery compartment. This way you are assured of accurate measurements every time. Easy-to-read LCD. A large LCD display shows the readings in clear digits that can be read at different angles. Specifications Range 0 to 999 ppm Resolution 1 ppm Accuracy (@ 20ﾰC/68ﾰF) ﾱ10 ppm Typical EMC Deviation ﾱ1% F.S. Calibration Manual 1 point through trimmer Temperature Compensation Automatic from 41 to 122ﾰF ( Battery Type/Life 4 x 1.5V / approx. 150 hours continuous Environment 32 to 122ﾰF (0 to 50ﾰC); RH 95% Dimensions 5.9 x 1.2 x 0.9” (150 x 30 x Weight 3 oz. (85 g)