5-in-1 Chlorine Water Tester — Accurate, easy-to-use pool and spa tester Key benefits Keeps swimming water safe: quickly measures residual chlorine to help maintain pool and spa chlorine levels within safe limits. Saves time and reduces guesswork: one handheld instrument measures five parameters so you don’t need multiple testers. Reliable results for decisions: high-sensitivity probe and automatic temperature compensation deliver more accurate readings across typical pool temperatures. What it measures pH value ORP (oxidation-reduction potential) Chlorine (residual chlorine) H2 (HA2) Temperature (with ℃/°F conversion) Main features High-sensitivity electrode probe: detachable, plug-in probe that is removable and replaceable for straightforward maintenance and long-term use. Fast, simple testing: just immerse the probe in water for a few seconds to read chlorine, pH, ORP, H2/HA2 and temperature. Automatic temperature compensation: built-in compensation ensures the most accurate measurements across environmental temperature ranges. Clear display and controls: large LCD with backlight for easy reading; supports data-hold and one-button lock to freeze readings for review. Automatic calibration: restores measurement accuracy when needed without complex procedures. Performance and compatibility Accurate measurement of residual chlorine and other pool water parameters to support safe, compliant water management. Probe design allows replacement or exchange without special tools, helping extend the device’s usable life. Temperature units selectable between Celsius and Fahrenheit for compatibility with local conventions. Practical use scenarios Routine pool and spa maintenance: daily or weekly checks to confirm chlorine, pH and ORP are within target ranges before opening the pool. Hotel, gym or public pool monitoring: quick field checks to verify safe water conditions during facility rounds. Troubleshooting water quality: verify whether chemical adjustments are needed after heavy use, rainfall, or system maintenance. How to use (brief) Insert/attach the probe if needed, switch the unit on. Immerse the probe in pool or spa water for a few seconds until readings stabilize. Use data-hold or the lock button to record values; convert temperature units as required. Calibrate per the automatic calibration procedure when prompted to maintain accuracy. What sets this tester apart Five-parameter testing in a single device reduces the need for multiple instruments. Detachable, replaceable high-sensitivity probe and automatic temperature compensation improve long-term accuracy and usability. Large backlit display and simple controls make readings easy to take and document in the field. Available functions are exactly as specified: pH, ORP, Chlorine, H2 (HA2) and Temperature, with probe replaceability, automatic temperature compensation, ℃/°F conversion, large backlit LCD, data-hold, one-button lock and automatic calibration.