The Fluke 77 was introduced in 1983 ... Annoyingly, there doesn’t appear to be any way to just calibrate the AC measurements, for example. Unless you’re a recovering Test Equipment addict ...

The meter he chose was a Fluke 15B+, the company’s budget offering ... but he did find an I2C EEPROM which he correctly guessed held calibration settings. Removing this chip gave him a meter ...