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A relative percentage humidity gauge or hygrometer made by reknowned manufacturers, Negretti & Zambra of London. The dial has a lovely clear enamel dial. On the back of the black metal case is a paper sticker – NZ 12, possibly indicating the code of the actual employee who assembled the instrument.

Excellent condition.

Negretti & Zambra Hygrometer c. 1925 England

£125.00Price