I have one of the more basic UNI-T multimeters and can highly recommend it. It's always there when I need it (the single 9V battery keeps it going for years) and has great precision. One thing that I don't have - and really want to have - is a variable power supply with constant voltage/current. They can be used when you have an unusual battery you need to charge safely, for instance. Unfortunately, they always seem…
the answer to your question is in Art of Electronics.