I've been offered this tester for a hundred bucks. Guy that has it is in his 60's and seems to know what he's doing, says it works and it comes with the manual. I'm just looking at it to eliminate shorted and completely dead tubes before I stick them in an amp to see how they sound. Not going into the tube selling business or anything like that. Just be nice to skip the light bulb limiter step with unknown tubes. Anyway does this sound like it'll do the trick ? Thanks.