Nice study, too bad you couldn't test the UT61E in this with its known temp drift issues.
I looked to see if I could find the GS certified 61E for a reasonable price.
Joe, good unfused Amp testing (sorry, I am trying to catch up on my video queue)
One detail about the temp testing: I wonder if there was thermal influence in the lead contacts? I am thinking about the interface between different metals, cable resistivity, etc... Despite the voltmeters have a very high input impedance, the differences are in the 10-3 to 10-4 range...
Glad you enjoyed the unfused testing. If I could have found a reputable Amazon supplier of counterfeit large body HRC fuses, I would like to do just a fuse test.
Yes, there will be an effect from the cables. Thermal and resistance both. This is true for inside the meters as well. A few things to consider, I used the same brand/type of leads through the chain and the thermal effects are going to cancel for the most part. If we look at the Brymen's location in the first test, we can see it is the second meter in the chain. In the second test, it is the eighth meter in the chain. The difference between these two locations in the chain is roughly 80uV. However, the meter was set to high resolution on test and low during the other. Actually, its a little worse on the first set where it's the second meter in the chain. 5KY's Fluke 107 has 4mV of error. This is 18 times worse than the Brymen. Consider the Fluke was the 4th in the chain in the second batch.
I updated the sheet to show the 5th place data for the Brymen and also included the first data set.