1. Surface Temperature: Everest
Characteristics
Infrared Temperature Sensor
Accuracy of ±0.5ºC or ±0.5ºF
Resolution of 0.1ºC or 0.1ºF
Temperature Range of -40ºC to 100ºC
Rugged Stainless Steel Case and Cable
Power requirements: 5V to 26V DC (Current Draw: 10 mA + Current Signal)

2. Surface Temperature: IRTS
The IRTS-P is a precision, infra-red thermocouple sensor manufactured by Apogee Instruments to make continuous measurements in field conditions. It is a unique, self powered sensor that measures emitted radiation and outputs the surface temperatures as a type-K thermocouple signal.

3. Surface Temperature: IRTS
Accuracy: ±0.2°C from 15° to 35°C and ±0.1°C when sensor body and target are at the same temperature
Wavelength Range: 6 to 14 µm
Field of View: 3:1 (At 3 m from sensor, the FOV is a 1 m diameter circle, as calculated from the geometry of the sensor and lens

4. Surface Temperature: Dodgy Calculation
Corrected target temperature is equal to:
CTT = ATT - SEC
where ATT = Apparent target temperature and sensor error correction (SEC) is the following:
SEC = (0.25/Psb)*(ATT-Hsb)^2-Ksb)
According to CSI the coefficients suitable to calculate Psb and Ksb are those from Bugbee et al. (1996) but this correction does not work over snow – or frozen surfaces

5. Petermann Measurements: (3) Surface Temperature
A comparison between the IRTS-P and Everest IR thermometer on the Petermann Gletscher 2003
The algorithm for the IRTS-P as defined by CSI is not applicable for temperatures below 0 °C