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Vintage British made Rototherm thermometer with probe for marine engineers. This is apparently a dial thermometer for Marine Engineers. This old instrument is marked "Rototherm Thermometer" on the metal rim, and "Rototherm, Brit. Pat. No. 370314, The British Rototherm C. Ltd. London, British Made" on the dial. It is marked from 0â°F - 300â°F on the dial. The rim of the front is made from metal, and the back from brass, and it is heavy. The thermometer is c1950. I am not sure if it is working. A great item for the vintage scientific instrument collector.