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Reference PCB for Calibrating DMM's
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Kleinstein:
For the UT61E I would expect it to be quite a bit better than the specs when new, but there is a chance that it will drift over time. The tolerace specs are not so much for the initial value but likely to a large part to allow for some dirft for the next 1-5 year (so the meter has a chance to pass calibration even after 4 years).  Getting the calibration right from the start is not that difficult and expensive, but keeping the drift low is tricky and costs money.
There usually are no seprate 30 days or 3 month specs for these lower rated meters, but expect quite some difference.

The older age GDM8251 may already had some dirft from aging. So I would not count on having it really much better than the specs.
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