We do not have the means for testing beyond power up.
The knob marked Level -3V to +3V is hard to turn also this same knob is marked - Pull for Negative Slope but we were unable to pull.
The knob is missing on the offset control but control itself seems to be fine.
The four digit set wheels for pulse count appears to be need replaced as they do not adjust as intended.
Selling as a Parts or Repair unit, AS-IS, no returns.
Free shipping to the 48 contiguous states in the USA.