Have a look at the Draper Tools website (or catalogue if you have one), stock number 46609, catalogue page 361.

This is rated by Draper as "Expert Quality" (ie, suitable for professional use). It contains both types of "clock" (plunger clock for 0-25mm) and a "finger" or stylus clock 0-1.5mm as well as a magnetic stand with fine adjustment and a range of tips for the clocks. I reckon this kit would cover just about every milling and turning need you have. Accuracy is quoted as 0.01mm.

Currently priced at around £82 (don't know your budget so don't know if its in your price range) but for the money you probably won't go far wrong with it.

http://www.draper.co.uk/catalogue/Alpha/Alpha-D.html

Hope that helps.