1. Measuring PH, TDS and temperature with high precision at the same time. 2. Equipped with high-quality titanium alloy probe, glass electrode, TDS, which can achieve fast and convenient testing. 3. LCD Display Screen -- High-definition and clear display of measured values, easy to observe and use, and easy to operate. 4. Automatic Temperature Compensation: Temperature can affect reading levels, our water meterr's automatic temperature compensation can ensure that you're getting the best possible reading. 5. Auto Calibration Function -- Digital PH tester factory calibrated, but recalibration is needed in case of long period of inactivity or after a frequent use. Before calibration, add PH 4.00/PH 6. 86/PH 9.18 calibration powders into beaker with 250ml (under the temperature of 25) of distilled water, then stir until the powder has completely dissolved. Push the auto-calibration button, the tester will automatically identify the calibration solutions. Brand: Product Name: Water Quality Tester Type: EZ-9901 Dimension(LxWxD): 183x 37mm Function: PH, Temperature, and TDS Battery Type: 3 x Button Batteries (included) Digital PH meter can be used to test drinking water, swimming pools, PH balance in aquarium, bath tub, spa, wine, beer and any other liquids. Colour:white + gray Material:ABS Package Contents: 1 x EZ-9901 Water Quality Tester 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.