pH Electrode Double-Junction/Refillable 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 Glass Diameter 12mm Length 130 mm Cable Length 3 ft Connector BNC Amplifier No Temp Sensor None Max Pressure Ambient For Use With OAKTON pH 510 Meter Standards NIST or USA Shelf Life 6 mo Reference Combination Electrode Junction Double Electrolyte Redox