YSI ORP15 Redox & Temperature Monitor
The OPR15 measures ORP (Redox, or Oxidation Reduction Pontential in mV) and temperature with the following features:- IP-67 waterproof case. Replaceable electrode. 50-set memory (ORP, temp, date and timestamp) Low battery indicator. "Hold" feature locks stable reading on display. Graphic display with on-screen instructions.