2 Pack pH Meter and TDS Meter, 0.05 pH High Accuracy Tester Pen, ± 2% Readout Accuracy Digital Water Quality Filter Pen, 0-9990ppm, Ideal Water Purity Test for Drinking Water, Aquariums, Hydroponics
- ...rofessional TDS, pH Pen. Upgraded with big LCD for easier reading, and hold-lock function for easier use. Just turn TDS meter on and stir water gently, then stabilized readings will be hold-locked on LCD in seconds, and the tds ppm meter will shut off automatically if without operation over 5 minutes..
- 【How to use calibration】- Press CAL for 5 seconds to enter the calibration mode, press in turn to select the powders corresponding to 6.86, 4.01, and 9.18 to complete the calibration. pH meter has been calibrated before delivery, the buyer does not need to re-calibrate after receiving the goods, In the following cases, the pH meter must be re-calibrated: Has been used for a long time after calibration.
- The measurement accuracy requirements are relatively high..