Tracer Products' TP-9354 COBRA-4 is part of the COBRA series of multi-purpose borescopes. It features a dual-head blue and white LED flashlight that enables technicians to inspect and leak check hard-to-see components such as pistons, intake valves, A/C evaporators, fuel systems, radiators and EVAP systems, without expensive disassembly. The blue-light LED is ideal for fluorescent leak detection and detecting surface flaws, while the white-light LED is great for component inspection. A press-fit coupler allows quick and easy attachment of the flashlight to the borescope.