Dissolved oxygen accuracy: +/-0.1 mg/L or +/-2 percent of reading, whichever is greater. Electrolyte: KCl with NA2SO4. For use with YSI 5000 and 5100 meter. Membrane Material: FEP Fluoropolymer Film Cap. Polarizing Voltage: 0.8 volts. Response Time: Typical response to a step change in dissolved oxygen at 20 degree C is 90 percent of the change in 30 seconds. Sensor materials: Cathode - gold, Anode - silver. Temperature: 0.2 degree C Accuracy, Operating Range: 0 to 45 degree C. 1 Year warranty.