The HP355d is a test bench must have because of its quality. This unit is still in spec and cleaned up nicely. It is important to make sure the BNC connectors on not too bent or damaged. Replacing them is not really an option because it will affect calibration. IMHO, don’t pay more than $50-$60, including shipping, unless the seller can provide evidence the unit is within spec. Otherwise you have an expensive paperweight. I am very satisfied with this purchase and seller!