Compact, pocket size meter with one touch calibration and temperature compensation. Compact, pocket size meter with a probe in a sealed case and sealed connections to keep out moisture. Operation is simple with one touch, automatic calibration. Simply dip the probe in standard solution and the microprocessor automatically distinguishes between standard solutions of pH 4, 7, or 9. The microprocessor will also perform the temperature compensation of the pH and display a diagnostic message. Has a long battery life of approximately 600 hours and will automatically switch off to reserve power if left on for over 30 minutes.