HIGH QUALITY DURABLE: It is highly accurate for 0-14 PH measuring range, 0.01 PH resolution, working temperature: 0~60; Measures and displays pH result simultaneously with LCD display, reliable and fast reading.Fast and accurate readings: just turn it on, dip in liquid display and read, no need work with color charts or test strips; a large LCD display makes it easy to read.Accurate: this meter get the result fast and accurate, the resolution is 0.01 and with high accuracy(0.01), measures full pH 0-14!WIDE USE: Pocket Size PH Meter is the ideal test kit for home and laboratory uses. Ideal use for testing water, pools, aquariums, spas, hydroponics, food, wine and beer making and more.Auto Calibration: No screwdriver required adjustment, just complete the calibration with the auto-calibration button and includes buffer powders.Features:- Materials: High quality ABS- Measuring range: 0.00 -14.00 PH- Resolution: 0.01 PH- Accuracy: 0.01 pH- Batteries: 2 x 1.5V (AG-13 button cell included)- Operating temperature: 0-80C- Service life: approx. 500 hours- Dimensions: 15.3 x 2.9 x 1.6 cm- Weight: 52gHow to use:< p>1. Remove the protective cover.2. rinse electrode with distilled water, dried with filter paper.3. Turn on the instrument, the electrode has been immersed in the test solution.4. stirring gently, waiting for a stable reading.5. Close the meter, rinse the electrode, and dry it with filter paper.Calibration method1.Press on/off to turn on the power.< /p>2.Press the calibration key once and the value is stable at 6.86 (calibrated 6.86) Take out the PH pen Rinse the electrode with distilled water and blot the liquid.3.Put the pH pen into the 4.00 calibration solution and press the calibration key twice until the value stabilizes at 4.00 (4.00 calibration is complete) ( 2-point calibration is completed).4.After the calibration is completed, place it in the solution of known value to be detected.If the displayed value is within the error range , it means the calibration is accurate and can be used normallyATTENTIONS:Clean the electrode with distilled water every time before and after use.Be careful with the glass probe as it can be a little fragile when you use it.Remember to wipe it gently with a soft, clean cloth when you have finished before covering it.Open the battery case or replace the battery, then need to recalibrate the meter.