This is a very nice newer model 10-12. The serial number has a “D” prefix character, and you can see the difference in the knobs used on the deck. The electronics appear to be the same as the older style 10-12s.
Precision 10-12 Tube Tester
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Precision 912 Tube TesterPrecision 912 Tube Tester
Restored Precision 912 Tube Tester. The case is actually in pretty good shape, with no damage and only minor scratches.