The EC150 is a Conductivity/TDS/Temperature Meter. Waterproof meter with high-accuracy multi-ranging sensor. Features Auto Power off with disable, Adjustable Conductivity to TDS ratio factor from 0.4 to 1.0, Data Hold and low battery indication. Waterproof design to withstand wet environment, meets IP65 standard. Includes meter, protective sensor cap, and four LR44 button batteries.