The DT-3 kit will turn your digital volt ohm meter into an accurate digital
thermometer with .1 degree resolution.
Measure temperatures from -40F to 250F.
The remote sensor is .25" sq. and can be mounted many (over 250) feet from the meter.
Power requirement: 9V Battery or
7.5 - 15 VDC wall transformer. (Well Filtered)
Printed Circuit Board Size: 2" x 1.35"
Here is the instruction sheet for the DT3 kit.