Just to share. I had mine Aipo drybox for a few years now. I put all my camera body, lenses, watches, batteries and certificates. No problem with it set at 43-45. It is one of the most useful investment I have ever purchased that I have bought to protect my other investments.
Frankly, I know a lot of people keep their watches in a safe inside a wall but they do not know the damage it caused due to the humidity between the walls that sips into the safe. I have a watch repairer who told me that his customer bought a Rolex to him that was kept in a safe for 7 years and discovered all the parts were warped or rusty because he hid it in a safe.