It’s obvious it came from a collector. It was cared for. As a fellow collector/user of older equipment, it was appreciated whoever owned it. Have not plugged it in yet, but I will. And I have all the confidence that it works. Very happy with the purchase
For what it is emission tester checks for shorts and emission in a compact case ,simple circuit will tell me if a tube is weak or shorted which could damage transformers or other tubes in an amplifier saving a costly disaster