Any recommendations for a DTI please?

I find myself needing one of these, to be more precise one of the lever types with quite a small FSD - something like the typical +/-0.4mm would be good, doesn't have to be mega accurate (it's just to check things are running true rather than doing a measurement). I see cheapy ones on the Bay of fleas are they any cop? or can anyone suggest anything that's good at a reasonable cost?
Thanks

PS Mods - how about a metrology/measuring equipment section perhaps?

Either cheapo of eBay, or if you want something cheapish that you know will be reliable, I'd look at Arc Euro Trade.