Portable PH meter acidity meter - with temperature supplement ATC-redConfiguration: test pen * 1 calibration powder * 2 instructions * 1 small screwdriver * 1 plastic box packaging * 1Weight: test pen net weight of about 54g, with plastic box packaging about 112g.Power: built-in 1.5v button cell * 3Measurement range: 0.00-14.0PHResolution: 0.01 pH; Accuracy: 0.01pH(ATC) automatic temperature compensation : 0-55Using environment: Recommended 050 RH95%Scope of application: water purifier, household water, tap water, food, aquatic fish tank, cosmetics, industrial sewage, marine, laboratory and other areas of testing. (Related knowledge: according to the results published by the various types of cosmetic pH test values, ph value is also one of the criteria for identifying the authenticity of cosmetics Oh, ph value is not within the normal range means that the deterioration can not be used)PH meter calibration.1, a packet of 6.86 correction powder to 250ML of water (distilled water / pure water / ph-neutral water only, room temperature), and gently shake. Put the pen down to detect the PH value of the solution, if it shows 6.8 then the pen is accurate.2, if the display deviates from 6.8 then use a small screwdriver to adjust the correction potentiometer (the small hole behind) until the display value and the ph value of the standard buffer solution at ambient temperature match. 4.0 correction powder correction time then the pen correction to 4.0 can be. Do not leave the water surface when calibrating the test pen.