5-in-1 Pool and Spa Tester This multifunction water tester measures pH, ORP, residual chlorine, H2 and temperature, helping you keep pool and spa water within safe limits. - High-sensitivity probe: plug-in, removable, and replaceable. Easy to use—submerge the probe for a few seconds to read pH, ORP, chlorine, H2 and temperature with improved accuracy. - Accurate temperature compensation: automatic temperature compensation with ℃/°F unit conversion to ensure precise readings across varying ambient temperatures. - Clear, practical display: large backlit LCD for easy reading; data hold and one-key lock reading to review results anytime; automatic calibration to restore accuracy. - Compact, durable design: handheld and sturdy housing designed for poolside use with a replaceable sensor for long-term reliability. Use scenarios - Home pool maintenance: verify pH and chlorine after dosing to maintain balanced, safe water. - Spa/hot tub safety checks: monitor pH, ORP and chlorine before and after use. - Portable or seasonal pools: quick water checks during setup or travel to ensure safe swimming conditions.