Set your height with greater accuracy with Johnson's digital depth gauge. This tool measures with ± 0.004" accuracy so that your readings are always exact. Its large, easy-to-read digital LCD screen displays in inches (decimal), inches (fractions) or millimeters and in both absolute and incremental modes at the touch of a button. The convenient freestanding measuring scale allows for hands-free use and includes a locking knob to easily lock the scale at any desired measurement. A depth pin is also included for measuring holes.