HM DIGITAL DM-2 Commercial In-Line Dual TDS Monitor Meter Testing For Hydroponics Gardening Aquariums Reefs Pools Spas Water Treatment Drinking Pure Filter system SPECIFICATIONS -Range: 0-9990 ppm -Accuracy: +/- 2% -Conversion Factor: NaCl (avg. 0.5) -Cable Length: 46" (including sensor), shielded cables -Sensor: Dual, 1/4" diameter for quick-connect fittings (model SP-3, included) -Digital Calibration: Digitally factory calibrated to NaCl 342 ppm. Re-calibration can be done separately for each line. -Power source: 2 x AA batteries -Battery life: Approx. 2 years -Size: 11.6 x 6.8 x1.8 cm (4.6 x 2.6 x .7in.)
