Weld spacing gauge:Easy operation determines rootweld spacing1. Unlock the retaining screw and insert the gauge interior alignment stops between the two pieces of pipe to be fitted2. Insert the leg with the taper into the gap until it makes contact with both slides of the gap.3. Re-lock the retaining screw, remove the gauge and read it4. The scale is calibrated in fractional dimensions from 1/32 to 3/16 in 1/16 inch increments, the read-out you receive represents the amount of rootweld gap:MetalworkingModel Number:2924043Internal Hi-Lo gauge:4 quick steps check internal alignmentYou can check the internal alignment of you fit-up quickly with the Hi-Lo gauge1. Unlock the retaining screw. press the gauge legs beyond the barrel2. Insert the legs (wired) into the gap space or the two pieces of pipe to be fitted, turn the gauge 90, being careful to apply a constant back pressure to the barrel3. Hold the gauge as square as possible with the fitting to obtain an accurate reading. lock the retaining screw. reverse the 90 turn and remove the gauge, you're now to read the increment opposite the 4. When the aligns with the 1/32 increment line you have a good internal alignment and fit-up. misalignment can be determined from the zero line by increment marking of 1/16 inchColor: black, silverMaterial: Stainless steelPackage Contents:1 * Wedling Single Gauge1 * Portable leather bag1 * manual