Two Face Plan Wheels Read Blueprint Drawings 1/8", 1/4", 1/2" = 1' Scale

Two Face Inch Counter Wheel - Easy grip 1 1/2 inch fixed handle and large diameter for easy readout. One side is fitted with a special dial for exact measurement of straight lines and curves on technical plans, drawings, blueprints, etc. While the pointer indicates traced distance in inches, the counter disk registers it in feet. The second dial measures distances on maps or plans made to scales of 1/2 inch, 1/4 inch and 1/8 inch to a foot and counts the number of full pointer. Packed in a leatherette case.