I recently bought a new cycle computer off Ebay. Cheap and cheeful which may tell us something. I used it yesterday for the first time in very bright sunshine, and very soon the inside of the screen misted up. Once home the misting went away. Today I took the battery cover and battery out and left the computer in the sun with the open battery compartment upwards facing what has been today a very hot sun. I am hoping this will dry out any moisture in the unit. I can't win lately, it's one thing after another.