Usage Tips: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:10kohmNote:Due to different production batches, the product appearance slightly, which does not affect the use.Colour:RedMaterial:PlasticPackage Contents:1 * Oxygen SensorOnly 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.