The used harness tester at the Phoenix shop was actually solid
I was sure buying a beat up DIT-MCO 2650 from a closed shop in Phoenix was a mistake, but after 3 weeks of tracing intermittent faults it's been dead on every time. The calibration sticker was from 2019, still we ran it against a known bad bundle and it caught the break in pin 14. Anyone else had luck with secondhand test gear that looked rough but performed? What do you check before you trust it?