Enhanced measurement functionality pH, ORP, ISE, Conductivity, Dissolved Oxygen For all conventional single parameter sensors The Multi 3320 for measurement of pH, ORP, conductivity, and dissolved oxygen (electro chemical) is a perfect meter for environmental applications in ground and surface water measurement, aquaculture, waste water treatment plants and much more. Two inputs for simultaneous measurement of pH and conductivity, or pH and dissolved oxygen. Backlit LCD for displaying two measurements at the same time For all conventional WTW pH, combined ISE, conductivity cells and electrochemical D.O. sensors