The Ohaus 30589820 a-AB23PH-B AQUASEARCHER pH Bench Meter is a simple and straightforward pH meter designed for easy measurement of pH and oxidation-reduction potential (ORP). It features a large LCD display and six instructional menu buttons for easy operation. The meter has auto buffer recognition and 3-point calibration capability for reliable calibration results. The stand-alone electrode holder increases flexibility for routine experiments and saves space in the lab. With a 99-item memory for pH measurements, it allows for efficient data documentation.