4 in 1 Digital PH Meter Tester: The PH meter has 4 in 1 function, which can measure PH/TDS/EC/TEMPERATURE at the same time with high precision and quickly. Omnidirectional measurement to ensure water quality. The electronic pH meters feature reliable quality, durable ABS material, waterproof IP 67, ergonomic pocket size, best price, all these make it your FIRST water quality tester. ±0.01 pH Measurement Accuracy: With a high-sensitive glass probe, the full measurement range of the swimming pool water tester is 0-14 pH, with a resolution of 0.01 pH. And the pH pool tester uses a 3-point calibration method and calibrates the electrode to pH 4.00, pH 6.86 and pH 9.18 solutions to ensure your measurements are accurate. < p>Easy Calibration: Simply immerse the electrode in the target solution, then press and hold the MODEL/CAL button for 5 seconds after the readings stabilize (usually 5 to 10 seconds), and the calibration will then be performed automatically. A large backlit LCD screen and