Favourite bike tool gadget
When I recently got a Specialized Roubaix as normal a new bike equals new tools. However, this time instead of yet another annoying splined spanner or socket with a ever so slightly different pattern to the half dozen I already have, I needed a torque wrench.
Although carbon fibre isn't as delicate as some folks make out, over tightening stems and seatposts can lead to dangerous/expensive problems so I got a Ritchey Torque Key. It's a loverly little thing, fits in the hand nicely.