To take measurements inside an area like a cabinet drawer, use your measuring tape from inside edge to inside edge. Take the reading and then add on the length of the tape housing which is often stamped on the case. Another way is to use your tape along with a combination square. Position the square upside down in one corner and pull the case past the square's blade. Select a number on the blade, and add the length of the tape.
No matter what size your workshop is, there are some basic safety tools you should not be without. A smoke alarm, fire extinguisher, safety goggles, and first aid kit are absolute must-haves. Plus, all of your electrical outlets should be equipped with ground-fault circuit interrupters. If an emergency ever should ever arise, a telephone should be nearby to enable you to call for help.