We use metrel all in one testers get heavy after a while around your neck, the rotary switch plays up after a lot of use and I dont like the multi plug connection, you have to constantly zero the leads. You also need an adapter to check R1+R2 on socket outlets as lead supplied with ours with plug top will only do live tests ie Zs. But the ones we use are about 2 years old and the new ones may be better for me I think it would be Fluke CJS