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Completely waterproof. The battery compartment is sealed against accidental splashing or brief submersion under one meter of water or plant food. Measures EC (electrical conductivity), CF (conductivity factor) and PPM (parts per million) scales. High conductivity measurement for a broad range of crops.Brand new and boxed. Factory calibrated.No external knobs or switches.Step by step instructions included. Auto turn on and off function activates truncheon when put in to, or taken out of solution.