We make it easy to measure accurately like a pro. Not every measurement is made in 1/4'' and 1/2'' increments. Rulers are for measuring 2 x 4's, not for making car parts. You can now measure in 0-6'' in .001'' increments with the Jeg's digital stainless steel caliper featuring a large LCD display, in either SAE or metric. Measure most any inside, outside and depth measurement. Handy on-off switch has been provided to preserve the life of the battery that is included with a protective storage case. By the way, 2 x 4's measure 1.756'' x 3.652''.