WATER QUALITY TEST PEN: PH TDS EC ORP Tester Support salinity, PH, TDS, EC, ORP measurement, stable performance, to help you conduct water quality testing. DETACHABLE PROBE: Water Quality Tester With a high-accurate detachable probe, the measurement error is small, which can prevent accidental damage of the probe. WATERPROOF AND DUSTPROOF: The waterproof and dustproof grade is IP67, water quality test pen supports short time immersion, convenient for seawater testing and water quality testing. ACCURATE & EFFICIENT: This water quality detector has a high performance, pen shaped design to ensure fast testing, stable values, and accurate calculation results. SIMPLE TO USE: Easy to use, turn on the switch key, put the detection end into the water to be tested, automatically display the PH value, simple and convenient, and high accuracy.