Which device uses UV light to kill bacteria in a dry environment?

The device that uses UV light to kill bacteria in a dry environment is the UV light sterilizer. This device is specifically designed to emit ultraviolet light, which has germicidal properties effective at destroying bacteria, viruses, and other microorganisms. The UV light disrupts the DNA of these pathogens, rendering them unable to replicate and effectively eliminating them from surfaces or tools placed within the sterilizer.

In contrast, an autoclave utilizes steam under pressure to sterilize equipment and is particularly effective for items that can withstand high temperatures and moisture. Ozone generators produce ozone gas, which can disinfect but typically require a specific environment and can be harmful to breathe, thus not being solely reliant on UV light for germicidal action. An incubator, meanwhile, is used primarily for growing cultures and does not possess sterilization capabilities in the context described. The distinction in functionality and the mechanisms of action is crucial in understanding why the UV light sterilizer is the correct answer.