The G.A.L. Pipe Pit Gauge will give long life in the field or factory. Range is 0 to 1/2" in 1/64" and 0.10 Increments. Arm can be locked in place at any dimension. All stainless steel. Gauge will fit in Shirt Pocket and comes in a pocket protector. Has Handy formulas on front & decimal equivalens on back.