Well, it passed power on test without errors as could be seen from the pictures (err light not on), unless the seller did not mention he deleted any error messages (which would be kind of fraud I guess). That said, power on test does not mean much, but you always have that issue with these units, most are only being sold that way. And even if someone does a short test and applies a voltage, then there is e.g. still the issue that the A/D drifts, and others. And such items seem to sell for even more.