Antique Vintage pocket damp detector humidity barometer in compass style

Description

Antique Vintage pocket damp detector humidity barometer in compass style.
the needle is missing.
Analogue Meter Hygrometer
History tells that these fantastic little items were 'mainly' used by the travelling Victorian wealthy to measure damp in hotel linen, when there wasn't any hotels of quite such grandiose status.
collectible piece of history
Sold as is