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Introduction : For this PH TESTER, it does not includes calibration liquid,the one you get maybe not accurate,In order to ensure the accuracy of this item pls make calibration when you get the parcel 100% brand new and high quality Display: LCD Digital Accuracy: 0.01 Resolution: 0.01 Operating Temperature: 0~80°C Measuring Range: 0.00~14.00 Probe Type: Precision glass bulb electrode Calibration Method: 2 points automatic calibration Power Supply: AG 13 Batteries(Not included!!!) Size:155*29*16mm Package: 10 x pH meter 10 x instruction manual ( English)