Abstract: A tiny 5-hole compound probe with NTC-thermister has been developed by the authors for measurement of flow parameters in the compressor. All problems encountered for the thermister to be used in measuring the flow temperature are discussed. The techniques for enlarging the temperature range measured are also considered, such as how to sift out the best thermister, how to apply a highly precise and voltage-stabilizing supply to an unbalanced bridge for transmitting an accurate millivolt signal, and how to set a limit to the self-heating power of the thermister. As a result, the temperature range is extended from 273K to 473K. The probe was tested in a single-stage compressor rig, and its function and performance were verified favorably.