The YSI Professional Plus handheld multiparameter meter provides extreme flexibility for the measurement of a variety of combinations. 

Designed to be tough and smart in the lab or field. And extremely versatile. The Pro Plus accommodates any combination of YSI Pro Series cables, sensors, and accessories.Want to measure DO in the field? Maybe pH/DO/ Nitrate/ conductivity? Or perhaps you need it to be a lab instrument that measures BODs? Whatever you need...the Pro Plus is your choice.

The new Quatro cable attached to the Pro Plus also allows you to utilize 4-ports to measure temperature/conductivity, DO, and any two ISEs among pH, ORP, ammonium, chloride, or nitrate creating an extremely powerful handheld multiparameter instrument.