1) Chemical equipment 2) Heater 3) Warmer 
[SCUBA] A demister is a substance applied to transparent surfaces to stop them from becoming fogged with mist deposit, often referred to as fog. Scuba divers often spit into their masks and then wash the surface quickly with water to prevent mist buildup that can impair vision. Several products are commercially available such as Sea Drops t...[vapor] A demister is a device often fitted to vapor-liquid separator vessels to enhance the removal of liquid droplets entrained in a vapor stream. Demisters may be a mesh type coalescer, vane pack or other structure intended to aggregate the mist into droplets that are heavy enough to separate from the vapor stream. Demisters can reduce t...
a device to dispel mist from the windows of a driver's cab
[n] - heater that removes mist from the windshield of a car
noun heater that removes mist from the windshield of a car
defroster (def. 2). · a type of defroster for the side window of an automobile.