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Portable grey and silver unit with a control knob and a reader dial with a needle and markings in degrees celsius from -30 to 20. Top contains three sockets for probes and the bottom is inscribed, 'Grant Thermistor Thermometer model S'. The unit is used to measure the temperature of items being probed, and is held in a black synthetic carrying case with a red lining. The front of the case is inscribed with the name of the manufacturer, 'Grant Instruments'.