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The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more. Measures electrical conductivity (EC), total dissolved solids (TDS). Excellent for hydroponic nutrient testing. Four scales: EC:S, mS; TDS: ppm, ppt Automatic Temperature Compensation (ATC) Water resistant Measurement Range: 0-9990S; 0-5000 ppm; 0-9.9 mS; 0-5.0 ppt Digital Calibration (push button) to any point within the meter\’s range Auto-off function, data-hold function and low-battery indicator Display: large and easy-to-read LCD screen includes simultaneous temperature reading Factory Calibrated:The COM-80 meter is calibrated with a 1413S solutioncan be recalibrated with digital calibration using the push buttons Includes a protective cap and batteries. SPECIFICATIONS EC Range:0-9990S; 0-9.9 mS TDS Range:0-5000 ppm (mg/L); 0-5.0 ppt Temperature Range:1-80C/33-176F Resolution:1S/ppm; 0.1 mS/ppt Temp. resolution:0.1C/F Accuracy:+/- 2% EC-to-TDS Conversion Factor:NaCl (avg of 0.5) Calibration:Digital calibration by push button Probe:Fixed Housing:Water resistant Power source:3 x 1.5V button cell batteries (included) (model LR44 or equivalent) Dimensions:15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches) Weight:53.9 g (1.9 oz) 1 year warranty