Waterproof pH Electrode with ATC, pH Electrode All-in one, Testing Parameter pH, Measurement Range 0-14 pH, pH Range 0-14 pH Units, Tip Shape Round, Operating Temp. Range 0 Degrees to 80 Degrees C, Body Material Epoxy, Diameter 12 mm, Length 130 mm, Cable Length 3 ft, Connector BNC, Amplifier No, Temp. Sensor Yes, Max. Pressure Ambient, For Use With OAKTON PH 300 Meters, OAKTON PH 310 Meters, OAKTON PH/CON 300 Meters, OAKTON PH/CON 510 Meters, Standards NIST or USA, Shelf Life 6 mo