5in1 Chlorine Meter: Multifunctional water quality tester for measuring pH, ORP, chlorine, H2, and temperature in swimming pools. Accurately measures residual chlorine levels to help maintain pool or spa water within recommended safety ranges. Highly sensitive probe features a removable and replaceable electrode with plug-in design. Simple operation—immerse the probe in water for a few seconds to measure chlorine, pH, ORP, H2, and temperature. Provides accurate measurement results. Equipped with automatic temperature compensation for precise readings across ambient temperature ranges. Supports ℃/°F unit conversion for temperature measurements. Large LCD screen with backlight ensures clear visibility of data. Includes data hold function to lock readings with one button press for convenient review. Supports automatic calibration to maintain measurement accuracy. Suitable for drinking water, aquaculture, fish tanks, agriculture, wastewater treatment, and river water quality testing. Can also be used to measure chlorine levels in swimming pools, spas, and hot springs. All readings are taken after automatic temperature compensation. Specifications: Name: 5in1 Chlorine Meter Material: ABS Battery: 3 x 1.5V button cells (not included) pH Test Range: 0.00–14.00 pH ORP Test Range: 0.00–1999 mV Chlorine Test Range: 0–4 mg/L H2 Test Range: 0–10000 ppb Temperature Test Range: 0°C–60°C / 32°F–140°F Item Size: 186 x 38 x 23 mm / 7.32 x 1.50 x 0.91 in Package Size: 210 x 80 x 50 mm / 8.27 x 3.15 x 1.97 in Package Weight: 160 g / 5.64 oz Packing List: 1 x 5in1 Chlorine Meter