HM DIGITAL DM-1 Inline 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: 24.5" (including sensor) -Fittings: 1/4" standard, also available with 3/8" or 1/2" -Power source: 2 x 1.5V button cell batteries (LR44 or equivalent) -Battery life: approx. 1000 hours of continuous use -Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
