On a miter saw, when you're cutting a 90 degree cut, the miter saw reads zero. On a protractor, it reads 90. So it's an unending source of confusion for people. RON HAZELTON: So Mark, show me how it works.
A ruler is used to measure units of length, inches, feet and yards. Standard rulers have inches on one side and centimeters on the other. A typical ruler measures up to 12 inches, and is equivalent to 30.48 centimeters. This is also equivalent to 1 foot. Each inch on a ruler has markings in between that are a fraction of an inch.
General Tools has grown to become the recognized industry leader for specialty hand tools and instruments. The 5 in. Digital Angle Ruler is ideal for finding angles in tight spots and with the lock angle feature, the user can improve accuracy and save time. This precision stainless steel digital angle finder with measuring rulers also has a built in reverse angle function for added usability and convenience. 5 in.