Here's a way to get more life out of an old hacksaw blade. Mount it on the side edge of your workbench with about half the width of the teeth sticking up over the top surface. This will give you a handy cutting tool. Make sure that the location of this cutter is both easily accessible as well as away from frequent brush up traffic.
When you want to measure something at home or in the hardware store and you don’t have a tape measure handy, try using a dollar bill. It’s 6 1/8 inches long and almost exactly 1 1/2 inches when folded in quarters.