YSI EcoSense ORP15A Pen

Combining accuracy and affordability, this pen-style instrument measures ORP (absolute and relative mV) and temperature. Results are shown on a clear, easy-to-read graphic display that also provides on-screen instructions. The compact instrument features a 50 data-set memory, a hold feature that locks readings on the display, automatic temperature compensation, a low battery indicator, and a user-replaceable electrode. IP-67 waterproof housing. One-year warranty on the instrument and six-month warranty on the electrode.