Milwaukee pH51 Waterproof Digital pH Tester offering high-precision measurements (0.0–14.0 pH range, ±0.1 pH accuracy) with a clear LCD display and rugged IP65 waterproof housing.Key Features & Applications: Features a long-lasting replaceable electrode probe with manual 2-point calibration; ideal for hydroponics, aquariums, swimming pools, fish farming, water treatment, and laboratory testing.