Check the listing for details. AO2 OXYGEN PTB-18.10 AA428-210 Oxygen Index Detection Oxygen Sensor. Condition: New. Listed at 56.68 USD. AO2 OXYGEN PTB-18.10 AA428-210 Oxygen Index Detection Oxygen Sensor 1pc British CITY car oxygen sensor AO2, the AO2 PTB-18.10 oxygen sensor used on the oxygen index tester is a consumable. When it comes into contact with the air, a chemical reaction occurs. Generally, the validity period of the oxygen sensor is one year. The package must be airtight, usually in a sealed plastic package filled with nitrogen, and the best storage temperature is between 0°C and 20°C. AO2 PTB-18.10 is used in various instruments related to oxygen testing, such as: vehicle exhaust gas detection instrument, exhaust gas environmental protection detection instrument, oxygen index test instrument. AO2 product parameters: (1) Output: 9-13mV in air (2) Range: 0-100%O2 (3) Accuracy: 0.01%O2 (4) Expected service life: 360,000% O2 hours at 20°C, 286,000% O2 hours at 40°C, or two years at STP in air (5) T90 response time: