Problem or issue is further complicated by dropshippers on ebay, aliexpress, etc that are selling these technical test equipment alongside with flower vase, phone casings, hair clip,etc . When sourcing, these listers shall get the lowest price on their market which are mostly likely known-factory-rejects that they do not know, or do not care.
Dave found a good deal for a process-calibration meter on aliexpress at an extremely good price. He did a video blog, many people here sent in multiple orders fully knowing that they were faulty with the hope of fixing them, but could not even get one delivered. Sellers did all kind of tricks after the market stock evaporated overnight so as to protect their online rating but these tricks actually worsen their rating as people here was aware of the situation and were willing to just reverse the order. This is a side-track, but is revelant in sourcing cheap no/new brand equipment online at this juncture. Maybe the situation may change, if it does likely the price shall proportionaly change with it.
Different course needs different horse, and different horse need different rider.