A camera engine, or "camera kit," is a ready-made, working, thermal imaging camera without the monitor and battery. This is sold by sensor manufacturers, like Raytheon, to companies who wish to get into the thermal imaging business quickly, with minimum engineering and up-front expense. For Instance, Raytheon sells their "Series 300" camera kit to a multitude of companies who make cameras for law enforcement, industrial process control, roofing surveys, surveillance, mines, and firefighting. Camera kits are not customized, they are standard products and all cameras that use the camera kit use the same electronics.