Features:
High precision thermometer with 19999 counts. 
K-type thermocouple. 
Data storage and recall. 
High and low temperature alarms. 
°C to °F convertible 
Auto power off.

Measuring principle:
This instrument uses an electrode to pass a voltage, and then measure the current, which depends on the resistance value changing with the temperature of the sample. The current value is shown as temperature reading. This instrument uses K-type thermocouple.