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The Extech waterproof ORP Meter is designed for measuring oxidation-reduction potential in various environments including swimming pools, spas, and industrial processes. The meter features an easy-to-replace electrode module and automatic calibration for hassle-free use. With a high resolution of 1mV and data validation indicators, it provides accurate readings even on fast changes. The meter also stores up to 15 readings for convenient reference. Ideal for pool and spa operators, aquatic engineers, water treatment specialists, and food safety professionals, the Extech waterproof ORP Meter is an essential tool for ensuring water quality and safety.