accurate ph tester-- pH Meter with a sensitive electrode sensor, pH tester with 0-14.0 measuring range could read accurate pH levels quickly and easily. Accurate pH tester Kit (0.01 Resolution) is accurate that it could test accurately within ± 0.01 pH. simple calibration-- pH meter comes with 3pcs pH calibration powder, press the calibration button (CAL) and hold the water pH tester at the pH buffer powder for several seconds, pH tester can automatically calibrate. automatic temperature-- When the temperature of the sample solution is different from the standard solution, pH meter has built-in automatic temperature compensation system (ATC) which can accurately determine the pH value of the sample at temperature 0°C-60°C (32°F-140°F). wide application-- Digital pH meters are Perfect for home and laboratory testing. pH pen can test pH and is Perfect for multiple scenarios Perfect for testing water, swimming pools, aquariums, spas, hydroponics, wine and beer. attention-- When not in use, please cover the cap. The glass electrode of the ph meter exposed to the air, that make the test error and the value unstable, which directly affect the pH meter working. Material: plastic colour: As Shown Package Contents: 1 x ph tester 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.