We’ll take a guess that most readers have a set of digital calipers somewhere close to hand right now. The cheapest ones tend to be a little unsatisfying in the hand, a bit crusty and crunchy to use.

Grab your screwdrivers, makers! There’s a new, more powerful Raspberry Pi in town… The just announced Pi 2, which goes on sale today, adds a quad-core chip and double the memory to support more ...