Complication · Display
Humidity Indicator
Partially verifiedA capsule containing a desiccant that changes color in the presence of moisture.
Definition
A capsule containing a desiccant that changes color in the presence of moisture.
Historical origin
Used to monitor the integrity of water-resistant seals.
How it works
A small window on the dial or movement houses a copper sulfate or similar chemical capsule.
It turns from light blue to dark blue or pink if moisture enters the case.
Pocket watch context
None.
Wristwatch context
A signature feature of Sinn (Ar-Dehumidifying Technology).
Identification
- A small circular window, usually at 6 o'clock, containing a color-changing material
Servicing notes
If the capsule changes color, the watch requires an immediate pressure test and service.
General guidance only. Complicated mechanisms should be assessed and serviced by a qualified watchmaker or clockmaker specialist, not adjusted at home.
Related photographs
No confidently matched photograph of this subject has been found yet. These photographs show a closely related record, and are not examples of the type described on this page.
Sources & references
- de Carle, D., Watch and Clock Encyclopedia
- Britten, F. J., Old Clocks and Watches and Their Makers
- Horological Journal (British Horological Institute), technical articles
Where sources disagree, the disagreement is stated rather than resolved silently.