Features: * Professional ORP electrode with high accuracy and extreme reliability. * Silver-silver/chloride reference gel. * Epoxy body, BNC connector and 3 meters cable. * 12.5 mm Dia, x 150 mm length. * Range : -2,000 to 2,000 mV. * Operation Temp. : 0 to 65 . * To cooperate ORP meter ( ORP-203, ORP-213, PH-206, PH-207, PH-208, YK-2001PH , YK-2005WA, WA-2015, WA-2107SD, NI-214 ). application for water conditioning, aquariums, beverage, fish hatcheries, food processing, photography, laboratory, paper industry, quality control.