36. Take Inside Measurements
There's a reason the hook on the end of your tape is loose on its rivets—and why the first inch is a few hashmarks shy of a load. When you put the hook over an edge and pull the tape taut, the hook shifts to make the first inch a full 16/16. When you push the tape against a wall, it slides in to compensate for the thickness of the hook, again giving you an inch for an inch. At the other end of an inside measurement, add the length of the tape measure's box to the last number you can read on the tape.