KINGLAKE Portable Digital LCD PH Meter Tester Monitor Auto Pen Test Water Soil Pool Hydroponic with ATC (Automatic Temperature Compensation) This pH meter is accuracy for testing PH level of liquids,Red and yellow color sent randomly With 0~50 ATC and Four Button Cell, Can Measure PH Accurate in Fluctuating Temperatures Measurement Range of 0-14 PH,Highly Accurate(0.01), Reliable and Quick Readings Use for home and laboratory pH test, include pool SPA, drinking water, Biochemistry experiment With ATC (Automatic Temperature Compensation) and Replaceable Electrode;Large Backlit LCD screen