Gain Express pH & Temp ATC Meter Pen w/Replaceable Probe Electrode, 0.00~14.00 &plusmn;0.05pH Accurate Water Quality Tester Thermometer, for Hydroponics, Food, Pool,Aquariums Measuring Range: 0.00 ~ 14.00pH Accuracy: pH: 0.05pH / Temperature : 0.5C Resolution: pH: 0.01pH / Temperature: 0.1C/F Calibration Point (adjustable): 4, 7, 10 ATC : 0~50C