Description Pocket pH tester includes models 10, 20, 30, 40 for measurement of acidity and alkalinity of liquids. Uses a flat surface pH electrode, the tester also can be used to measures the pH of semi-solid substances, such as cheese, creams, meats, etc. Applications: * MPH-10S, 20S, 30S: suitable for measuring the liquids. * MPH-10F, 20F, 30F: suitable for measuring the semisolid substances. * MPH-10L, 20L, 30L: suitable for measuring the small volume samples. * MPH-40 is suitable for connecting with the various pH electrodes MPH-10 Features: * 2 points push-button calibration with auto-buffer recognition. * Hold function freezes current measured value for easy viewing and recording. * Auto-Power Off helps user effectively conserve battery life. * Replaceable electrode module reduces maintenance and replacement cost. MPH-20/30/40 Features: * 1 to 3 points push-button calibration with auto-buffer recognition. ?Selectable pH buffer options (NIST or USA standard). * Selectable pH buffer options(NIST or USA standard) * Automatic Temperature Compensation ensures accurate measuring result. ? Auto-Hold function freezes stable reading for easy viewing and recording. * Auto-Hold function freezers stable reading for easy viewing and recording. * Auto-Power Off helps user effectively conserve battery life. * System menu allows setting the 5 parameters, including the pH buffer standard, number of calibration points, temperature unit, auto-power off, etc. * Reset feature automatically resumes all settings back to factory default option