This instrument is a compact sized Digital Thermometer designed to use external K type thermocouple as temperature sensor. Temperature indication follows National Bureau of Standards and IEC 584 temperature / voltage tables for K type thermocouple. RTD Thermometer is mainly using for monitoring high precision temperature and measuring scopes. The thermometer can display changes among the three units : Kelvin, Fahrenheit and Centigrade, and it also has memory, reading the MAX and MIN values function.