YSI Pro10 [6050010] pH/ORP/Temperature Meter (Instrument Only). The YSI Pro10 pH meter is a field-rugged handheld meter that measures temperature and either pH or ORP (Oxidation Reduction Potential). User-replaceable sensors and cables (sold separately) and convenient calibration routine features make it user-friendly. Durable casing and 1-meter drop tests ensure years of sampling even in the harshest field conditions. Easy to use, rugged and reliable, the YSI Pro10 provides everything you need in a handheld instrument for the measurement of temperature and either pH or ORP. Userreplaceable sensors and cables, 50 data set memories, and convenient calibration routine make it user friendly. A true field instrument; Mil-spec (military spec) connectors, IP67 waterproof, rubber over molded case, and 1-meter drop tests ensure durability to provide years of sampling even in the harshest field conditions.