The output of the AO2 sensor changes with temperature, but the thermistor is gradually integrated to compensate for these changes. The thermistor helps provide the AO2 with a 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 exposed to 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 20μV (10) Temperature range: -20°C to +50°C (11) Temperature compensation: Less than 2% variation from 0°C 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 minimum: 10 kΩ Note: Due to different production batches, product appearance may vary slightly; this does not affect functionality. Color: Red Material: Plastic Package Contents: 1 x Oxygen Sensor Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3 cm.