Simple to Use Benchtop Meter for Easily Measuring pH and ORP. Designed with a large LCD Display and six instructional menu buttons, AB23PH is a simple and straightforward pH meter. Auto buffer recognition and 3-point calibration capability ensures a reliable calibration result. Stand-alone holder increases the flexibility for routine experiments, and makes AB23PH a perfect space saving bench meter for your lab. A 99-item memory for pH measurements ensures efficient data documentation.