I want to test the ignition on my 1996 Mercury 150hp V6 outboard using a DVA meter (or similar). Basically, I want to test that the spark is strong enough at idle. My motor runs fine at WOT but does not idle well. I want to eliminate a weak spark as a possible culprit before I remove/clean/adjust/mess with my carbs or timing. I already checked the spark with an inline spark tester and saw that I have a spark on all 6 cylinders.
The literature that I have read about DVA adapters says that the adapter should be used with a "good" multimeter. (emphasis added). I am not clear, however, on what would be considered a good enough multimeter or what would be the problem with using a cheaper (not so good) multimeter.
1) I already have a $20 analog multimeter that I bought at Home Depot. Would this multimeter be OK to use with the DVA adapter or is it highly beneficial to have a better one, like a Fluke 16?
2) Is a Piercing Probe Set (sticks a small needle into the spark plug wire) needed to test the spark or is there another way to do this without spending money for a probe set?
Thanks for any information on this