Clearly explained, good video mate. Just two points to mention 1) GS38 doesn’t relate to the test instrument it only requires that the test leads are of an adequate length and the there is no more than 4mm maximum ideally 2mm of exposed tips. (2) when you null the test leads you are not removing the resistance of the leads as such , the MFT takes a reading of the leads resistance and a deducts it from the test , . The test lead and any conductor will always have a resistance . But a good demonstration and video 👍
