You’re probably saying to yourself, hey, wait a minute, that’s a bracelet. Or a very small belt. Well, yes, the wrist ruler ($20) is a bracelet. It’s leather with a metal knob, in fact. However, etched on that leather is a rule in inches and centimetres, thus allowing you to measure most small DIY projects without resorting to carrying your tape measure around. Plus it looks pretty sharp, so that’s a bonus.