Hanna HI98304 DiST 4 EC Tester - Waterproof High Range Conductivity Meter 0-20 mS/cm camping pump filter One is for turning the

One is for turning the meter on/off and the other for automatic one point calibration

Remove the old filter cartridge

Healthy Water — Without the Junk

Store electrode upright to prevent leakage

No electricity costs: Passive system saves energy and money

Hanna HI98304 DiST 4 EC Tester - Waterproof High Range Conductivity Meter 0-20 mS/cm camping pump filter One is for turning theThe Hanna Instruments HI98304 DiST 4 is a high range electrolytic conductivity (EC) tester that can measure up to 20. 00 mS cm making it ideal for a variety of applications including water treatment, boilers and cooling towers, agricultural including hydroponics, and general laboratory use. The DiST 4 is a rugged and reliable pocket sized tester for use in the lab or field. This modern looking meter is only 0. 7" thick and extremely ergonomic, fitting