[Function]This shingle gauge is used to measure the thickness of shingles and evaluate the period based on thickness and is designed to have the tightest analytical tolerances. [Applicability]It estimates the level of asphalt composite shingles 3-tab fiberglass, 3-tab organics and laminated shingles. [Easy to Carry]The shingle gauge pack comes with a hiking buckle that makes it easy to carry when using it, and it has a 5-inch ruler on the other side. [ Quality]The shingle gauge roofing is made of high quality stainless steel with a thickness of 3mm, high hardness, rust and corrosion resistance, and long applicable life. [Notes]This gauge is for use only asphalt composition shingles installed prior to January 2011. Color: As Shown Material: metal Package Contents: 2 x Shingle Gauge Only 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.