[AUTOMATIC CALIBRATION]The PH meter has an automatic temperature compensation function that adjusts to water temperatures and water quality to give pH readings almost instantly.No need any adjustment screwdrivers before use, just finish the calibration with Auto calibration button and included calibration powders. [EASY & FAST & ACCURATE]The digital PH water quality meter is very accurate for a measuring range of 0 to 14 PH, a resolution of 0.01 PH;Just simply remove the protective cap, immerse the pH meter electrode in the solution, turn on the PH by the "ON / OFF" switch and read display result, no need to work with color charts or test strips;Measure and display pH result simultaneously with LCD display, reliable and fast reading. [COMFORTABLE DESIGN]extra 3 sets PH Calibration Powder, easy to calibrate with supplied pH 4.00 and 6.86 and 9.18 PH Calibration Powders makes it more accurate than test strips. Backlight LCD Display is easy to to read. Hand- pen style makes it conveniently fits in your pocket or bag and goes anywhere. [WIDELY APPLICATION]Pocket Size PH Meter is the perfect test kit and laboratory uses;Suitable for testing pH balance value of drinking water, pool, aquariums, spas, hydroponics, food and wine;A very functional product to accommodate the pH value of all liquid to measure. Colour: Yellow Material: ABS Package Contents: 1 x PH meter 3 x PH Calibration Powders 1 x Transparent box 2 x 1.5V LR44 batteries 1 x User manual in English Only the above package content, other products are not included. Note: Light 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.