Try getting one with a 200Ma continuity test on it, like the insulation testers usually have. If you get an insulation tester make sure you know how to use them safely. A read of the IEE Wiring regs or PAT testing will virtually tell you what sort of multi meter you require. Although many are probably sufficient for most fault finding on boilers. The fluke is good but dear. And fluke can measure micro amps to check ffd's and flame proving as well as temperature. But I figure if you suspect those devices they are fairly easy and cheap to replace or carry a spare to try than pay out for a fluke. It is said Kane make a model as well just Google HVAC multi meter.
I loved rolling out the multi meter and diving in, but sometime it took hours to sort and often could not find the problem anyway. While my mate was more forward and sometimes just gave the boilers a bang. He usually got more working with a good bang with whatever he had in his hand than I did with all the technical stuff.
