Distributor Tester
Here is a sun ignition tester mounted to a sun distributor tester, looks really similar. As far as I know you looked at the color of the spark to determine how hot. Had nothing at all to do with measuring the curve, etc. Two different animals working together. I can see a pointer and timing light along with a tach can document a curve. Hope it helps. Pretty cool though either way. Just make sure that is grounded to the 12V source to be safe also.
Here is a sun ignition tester mounted to a sun distributor tester, looks really similar. As far as I know you looked at the color of the spark to determine how hot. Had nothing at all to do with measuring the curve, etc. Two different animals working together. I can see a pointer and timing light along with a tach can document a curve. Hope it helps. Pretty cool though either way. Just make sure that is grounded to the 12V source to be safe also.