Extech PH110 Exstik Digital Handheld pH Meter is designed to measure pH in solids, semi-solids, and liquids which eliminates electrode breakage and clogged junctions. The Extech PH110 features CAL alert notifications to notify the user when to recalibrate the unit, on-board memory that stores up to 15 sequentially labeled readings to easily view changes over time, and automatic temperature compensation.