Dilog 9110 has all the tests you need for domestic.£499 brand new. The dial on it is not very positive, feels loose though. Although it does switch, when you have been used to Kewtech it feels a bit cheap. British made though :
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The Kewtech, on the other hand has a very firm and positive switching. Personally I always use Kewtech as all tests are accessed through the dial. There is some switching/choice on various tests such as type of RCD. Megger and Fluke have menus and submenus. I find having to go through and drill down into functions time consuming and potentially confusing. I like to keep things simple. You can get all the six RCD test displayed on the kt64 upward at one time. On all the other MFT you again have to cycle through the results also time consuming and prone to operator error at times. You won't get more straightforward then Kewtech mfts'
I don't think you NEED it calibrated for now as you say you just want to experiment and find your way around testing. Although it has been said earlier the Electrician will have a tester..... People who have worked for me learning have often said how they are never allowed to do testing. It appears sparks can be pretty mean on learners not letting them anywhere near their precious tester! I feel that is a pretty stupid policy as you need the apprentice to get hands on (supervised) experience. After all they will be worth more as an assistant if they can be taught to do the testing.
I find often that while newbies have their level 3 T&I, they often fumble with testing even though they already "know" it. Often they cannot interpret results that do not fall within the test rigs they learnt on. I mean for instance when they do a Zs and it is 1.57 for an RFC, what now?!!! What do you do?
