Casella BS2842/66 UB 5821 5497 sling Psychrometer whirling hygrometer wet and dry thermometer untested in original case. This was my Grandads who was a building surveyor. Apparently, this scientific instrument measures wet and dry temperatures. It appears to be in good condition but it has not been tested by me. Made in England by Casella London. Length of case 23cm. Width of case 7.5cm. Width of case plus handle 16cm approximately. Please see photos for more details and contact me for more info.
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