Ion Selective - Wide Screen Professional pH Meters are equipped with calibration check electrode response monitoring. Microset Instrumentation & Controls manufactures Ion Selective - Wide Screen Professional pH Meters. Microset Instrumentation & Controls also manufactures wide range of transmitters and sensors. Ion Selective - Wide Screen Professional pH Meters have separate pH and ISE channels. It is offered with 5 calibration points with 2 custom buffers. It is equipped with Large, custom LCD and High and low audible alarms. It has GLP capabilities.