7in1 water testing pen with seven detection functions including pH measurement, providing complete water analysis in a compact handheld device. Suitable for pool maintenance, aquarium care, laboratory testing, and household water quality monitoring. Lightningfast, accurate results: dualchip architecture and optimized circuitry enable rapid data processing with stable calibration values, delivering reliable measurements in seconds for professionals and home users who need quick assessments. Crystalclear display with smart layout: the display is designed so that each function has a direct, onetoone correspondence with its display element, minimizing reading errors and making results easy to interpret. Key benefits at a glance: Combines seven detection functions, including pH, in a single portable device. Delivers calibrated results in seconds with stable performance. Intuitive display layout that reduces interpretation errors and ambiguity. Use scenarios: Pool and spa water testing to ensure balanced, safe water. Aquarium and fishkeeping maintenance to monitor essential water parameters. Laboratory onsite testing for quick water quality checks. Household drinking water monitoring for peace of mind and compliance.