It's my opinion that rubber gloves aren't a good alternative to proper mechanic's gloves.Here is a good video showing another light bulb coil tester that is no good. Open gap type clearly shows proper coil condition at low to high revs. Chalk up another win for the PET-4000.
Starts at 6:40 into the video.
Not to mention using a worthless spark tester. Adjustable air gap testers are more expensive, but if one wants something that works, bite the bullet and buy it. Cheap tools only make your job harder.
