Great review Russ, up to the usual high standard, another one to bookmark.
If you do a search on ebay for "banana plug crocodile clip lead" you can use these leads with a multimeter. Put the crocodile clips on the atty posts, that leaves both hands free to push the fire button and read the voltage across the coil. Also they avoid the risk of shorting out and dropping the spring. Or you could just fit crocodile clips to your doohickey, just a thought.
If you do a search on ebay for "banana plug crocodile clip lead" you can use these leads with a multimeter. Put the crocodile clips on the atty posts, that leaves both hands free to push the fire button and read the voltage across the coil. Also they avoid the risk of shorting out and dropping the spring. Or you could just fit crocodile clips to your doohickey, just a thought.