MadAsAHatter
Well-known member
Amazon has one of those 4 probe bias meters on a black friday sale for just shy oh half price after the additional 10% off. $100 normal is a bit of a risk, but for $56 it's worth a shot.
https://www.amazon.com/Vacuum-Teste...2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRm&psc=1
https://www.amazon.com/Vacuum-Teste...2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRm&psc=1