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 ...

In order to find out if his Fluke 12E+ multimeter ... checking if the hidden features had received their EOL calibration by hooking the meter up to a waveform generator. Apparently, it reads ...