This is a aircraft thermocouple meter, I think it was used on the b17, this meter uses the K type sensor. The meter was used to check cyl head temp. It has two channels or uses to sensors.
OMEGA DIGITAL PANEL THERMOMETER READOUT DP461-T Save 75% off retail price by buying new surplus! • Temperature Models Accurate to 0.5°C (0.9°F) • Versatile Temperature Meter with Selectable Thermocouple Input: J, K, T, E, R, S, and B
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