
Underhood lights, headlamps, magnetic work lights, and borescope cameras.
Work lights and inspection tools turn "I think that's the leak" into "yeah, there's the leak." A rechargeable LED work light with a magnetic base sticks to the underside of the hood and lights the engine bay hands-free; a thin pen-light or borescope gets you into spots your eyes can't — checking cylinder walls through the spark plug hole, finding the source of a coolant drip behind the timing cover. Reach for them on every diagnosis job. Pair with a mechanic's mirror for seeing around blind corners and a quality OBD scanner for the digital half of the diagnosis.
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