Dual scale tape measures
In my ongoing campaign to make myself literate in metric (used everywhere in the world except the US), as much as possible I try to measure only in metric. I got a Komelon dual scale measuring tape (both metric and inches on one side) and after a month or so, I can think in metric. I really like Komelon measuring tapes because they are inexpensive but high quality. They have four in different sizes in dual scale from 3.5m/12ft for only $5, to a 9m/30ft for $8.50. The 9-meter one is big in the hand but an incredible bargain; however their 5-meter is probably a good size for general use. — KK