I have a Bird 43 and a 1000H slug purchased used separately. The needle barely moves when pushing ~500W through it. I want to figure out if the issue is with a meter or with the slug so I know which to ask for a refund on. (1) I get zero ohms from contacts where you plug the slug in to all the way to the meter movement connections. I have cleaned all contacts as well. That just leaves the meter movement. How do you know if a meter movement in a Bird is good/bad? (2) How about a slug? I have read that you can check a slug like you would a diode, but I'm getting continuity in both directions (only less on the other direction). Thanks!