9mm Case Gauge
These things are great. I just found a 9mm Makarov round that made it all the way through a 500 round 9mm Luger loading session. Didn't catch it will I picked up the fully loaded block to see one round sitting a bit lower that everything else. Don't know what would have happened if it made it to the range... But these case gauges are the final part of every loading session for me.