A weatherproof gadget is made so so that exposure to the weather will not interfere with successful operation in rain, spray, and splash. A waterproof object is one that is unaffected by water. However, just because something is waterproof it doesn’t mean that you should go diving with it. There is a ratio called the Ingress Protection Rating, which essentially defines how well a device will stand up against punishment. If you look in our part two at devices we describe as waterproof there should be some guide to how well a device will stand up against pressure. If you plan to go diving, or really put your LED flashlights under pressure then you might want to look for a gadget with an IP rating of IP68.