Extech HD500-NIST Digital Psychrometer IR Thermometer with NIST certificate provides Type K Temperature function for contact temperature measurement to 2501°F (1372°C). It has a built-in InfraRed Thermometer for non-contact temperature measurement to 932°F (500°C) with 30:1 distance to target ratio. HD500-NIST comes with NIST traceable Certificate of Calibration.