2X 4/09 Shingle Gauge, Shingle Gauge With Carabiner, Roof Shingles Measuring Tool, Roofing Tools And Equipment [4/09 Tile Gauge]4/09 Tile Gauge estimates the warranty level of asphalt composite shingles 3-tab fiberglass, 3-tab organic and laminated.[Function]Measure the thickness of shingles and correlate the thickness with the warranty level based on the analysis. Designed with the tightest analytical tolerances.[PROFESSIONAL TOOLS]This is a roofing tool and equipment designed with the tightest analytical tolerances for evaluating the relationship between tile thickness and warranty period.[Good choice] The tile gauge is equipped with a carabiner, which is easy to carry when using. The roof tile measuring tool has a 5-inch ruler on one side.[Note]This gauge only applies to asphalt shingles installed before January 2011.color:SilverMaterial:Stainless steelsize:149 x 31 x 2.5mmPackage Contents:2 x roofing toolsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.