The output of the AO2 sensor changes with temperature, but the thermistor is gradually integrated to compensate for these changes. The thermistor is used to give the AO2 a very stable output over a wide temperature range. The AO2 PTB-18.10 oxygen sensor used in the oxygen index meter is a consumable item. When it comes into contact with air, a chemical reaction begins. 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 in air at STP (5) T90 response time: Less than 5 seconds (6) T99.5 response time: Less than 40 seconds (7) 100% oxygen signal: 100% (8) Linearity: 0-100% O2 (9) Zero offset: Less than 20 µV (10) Temperature range: -20 to +50°C (11) Temperature compensation: Less than 2% variation from 0 to 40°C (12) Differential pressure range: 0-500 mbar max (13) Absolute pressure range: 500-2000 mbar (14) Relative humidity range: 0-99% non-condensing (15) Long-term output drift: Less than 10% signal loss per year (16) Recommended load resistance min: 10 kohm Note: Due to different production batches, the product appearance may vary slightly, which does not affect the use. Color: Red Material: Plastic Package Contents: 1 x Oxygen Sensor Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.