
All Apogee IR sensors are NIST traceable and include a calibration certificate. Sensors are calibrated to a custom black-body cone, with the Research-Grade sensors featuring a measurement uncertainty of ±0.2 C from -30 to 65 C when the sensor (detector) temperature is within 20 C of the surface (target) being measured. Lower-cost Commercial-Grade sensors have a measurement uncertainty of ± 0.5 C from 0 to 50 C when the sensor is within 20 C of the surface target. Radiometers are only sensitive from 8 to 14 m (atmospheric window) to minimize the influence of water vapor and CO on the measurement.
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