Affordable Benchtop pH Meter with Electrode ST320 for Basic Laboratory Applications. User-friendly bench meter that clearly displays information - with five distinctly marked keys which allow users to operate with minimal training. Designed with a clear, user-friendly interface and the ability to store up to 99 items in its internal memory, the StarterTM 2200 pH bench meter is a reliable and efficient addition to basic laboratories or science classrooms. An affordable, intuitive pH measurement instrument, the StarterTM 2200 pH bench meter also features auto-buffer recognition & auto-endpoint modes that make measurement and calibration simple, straightforward and efficient.