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