Push-button pH calibration at up to five points. Manual or automatic temperature compensation (ATC). Stores and recalls 16 sets of pH/mV (or relative mV) readings with corresponding temperature. Easy-to-follow calibration and measurement instructions. Hold function; auto off option; ready function. Also available: replacement pH electrode (244-26491), replacement temperature probe (244-25405) and replacement all-in-one combination pH/temp. probe (244-26581).