Abstract: Disclosed herein is a livestock temperature measuring and detection system. The system includes a housing, typically made from engineering plastic. Within the housing is a probe defining a thermistor having a threshold temperature. The thermistor is inserted in the livestock's ear. The threshold temperature is pre-set for monitoring a particular livestock condition. The housing includes a visible display. The housing includes a microprocessor which monitors the thermistor and upon detecting the threshold signal activates the display for visible observation.