MINI pH meter,pH tester, CT-6020 pH 4 and pH7 buffer solutions are included Easy to Change Electrode Temperature Measurement (C/F) IP67 Waterproof protection Auto Calibration for pH4, PH7 or pH10 High Input Impedance LCD with two displays and bar graph indicator Data hold function Auto power off 100 point datalogger with recall Display LCD Size: 20mm x 28mm Measurement Range pH = 0-14pH Temp = 0 to 50ºC (32 to 122ºF) Resolution pH = 0.01 pH Temp = 0.1ºC / 0.1ºF Accuracy pH = ± 0.02 pH Temp = ± 0.8ºC / ± 1.5ºF pH Electrode Included pH Temp Compensation Automatic temperature compensation Data Hold Freeze the display reading pH Calibration pH7,4 or 10 (3 points)