I was not having a go at you and can spell important (i was using an ipad yesterday). The advice I gave, I would give to anybody starting out.Says the one who can not spell "important" . But on a serious note, while I do understand what the measurements should be for the particular test I am carrying out and how the readings may be affected under certain circumstances, such as unwanted parallel paths during loop impedance tests for example; It is fair to say that I don't know everything, as it took me quite a while to learn and find out that the MK RCD's in my CU were affecting the accuracy of my No-Trip loop impedance measurements.
I went for the model that I did because I wanted the data download and recharging facility's, not to mention the Megger MFT 17XX series are nicely laid out from an operators point of view. The manual in photo two I printed myself as it did not come with a physical copy of one, only a digital version on the CD.
I have no interest in your choice of MFT, we all have a preference, and was not criticising your choice.
Here is a scenario: you get your MFT and the tests you run in your home all work perfectly. You then get a call to a house to fit an outside socket.
You test the Zs and get the results you got in your house. Where do you start? I'm not having a go at you here. You are about to charge people for your electical expertise and I'm trying to help as you won't have an experienced spark alongside you. I would also point out that you will need insurance.