Oakton benchtop meters measure the alkalinity and acidity of semi-solid or liquid samples. They feature a bright and large display to make readings visible from even a distance and a stability indicator to detect changes in the samples being tested. They include water-resistant membrane keypads for password protection and an integrated cal-due alarm to remind of re-calibration. The built-in probe allows the meter to sense and determine pH. These meters can store 500-point data with date & time stamp. Raptor Supplies also offers Oakton pH 5+ and pH 6+ water meters with auto power-off function.