Pyrokolor optical pyrometer in cardboard case, range 800 to 1800 degree C, by the Bowen Instrument Co. Ltd., Leeds 7, West Yorkshire, England, 1925-1974.
Pyrokolor optical pyrometer in cardboard case, range 800 to 1800 degree C, by the Bowen Instrument Co. Ltd., Leeds 7, West Yorkshire, England, 1925-1974.