Fluke117 Electricians True RMS Multimeter with a NIST-Traceable Calibration Certificate with Data

Q: what es the due date for the NIST certificate?

I believe to maintain an NIST Certification, the instrument must be calibrated once a year.

Q: Which model is more accurate in testing milivolts....the 115 or the 117? Are these calibrated by the same machine as the 117? I want best accuracy.

As I have not used the 115 I am not able to answer this question.

Q: Is this model used for electronic/PC testing?

This is meant more for electrical/HVAC work than for electronics. Like probably any other multimeter, though, it'll measure volts and ohms. You might take a look at the Fluke 17b+ and/or the Fluke 101 as more typical choices for electronics work, but it depends on the details of what kind of measurements you need to make.