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, 286,000%O2 hours at 40, 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 in signal:1001% (8) Linearity:0-100%O2 (9) Zero offset:Less than 20V (10) Temperature range:-20-+50 (11) Temperature compensation:Less than 2% variation 0 to 40(as shown) (12) Differential pressure range:0-500mbar Max (13) Absolute pressure range:500-2000mbar (14) Relative humidity range:0-99% non-condensing (15) Long-term output drift:Less than 10% signal loss/year (16) Recommended load resistance min:10kohm Note:Due to different production batches, the product appearance slightly, which does not affect the use. Colour:Red Material:Plastic Package Contents: 2 * Oxygen Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.