Fluke 80TK Thermocouple Module. Fast, High Accuracy Temperature Measurement. Compatible with any DMM having 10MW or greater input impedance and a mV dc scale. Converts any Fluke DMM to a thermometer via standard banana plugs. (Not required for Model 51 and 52). Uses Type-K thermocouples with mini-connectors. Switch selectable for °C or °F. Low-cost, powered by standard 9V battery. Battery test instructions included.