These instruments have brass cases with super durable, tarnish-free coating and QuickFix fitting system (see explanation below). Case diameter 5.5", depth 2.5", internal face 3.75", external face 4.5". Quartz clock movements use one AA battery
Fitzroy Thermometer/Hygrometer Chrome
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The unique QuickFix system allows the instrument to be locked hard to a bulkhead or wall but removed, in seconds, by hand. The instrument is supplied with a base plate which is screwed to the wall or bulkhead (instructions and drill hole template included). The instrument then simply slots over the base plate and with a gentle twist, is locked on. A reverse twist removes it again. This makes changing batteries easy, removal for storage easy, and avoids the tricky job of not scratching your polished case when screwing the instrument to the wall! QuickFix can also act to seal clock mechanisms making them waterproof.