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 ...

The Fluke 77 was introduced in 1983 ... like [Dave], you probably don’t have all the gear nearby to perform this calibration yourself — something to keep in mind if you try this at home.