Quick, question I want to check the spark from my coil, but I'm by myself and can't turn the key and hold the screwdriver too. Does anyone know of a way to do this when theirs only one person.
The adjustable ones are much better as you can assure that you are jumping a minimal gap for proper firing.
For larger HP motors, the multi way testers are nice as you can visualize the difference in spark between cylinders simultaneously. They can also be used in conjunction with a compression gauge when testing compression instead of grounding out the leads.
Mavs make sure your spark is jumping a good 7/16 of an inch with a bright blue ZAP!!