Accurate Measurement: Shingle gauge is specifically designed with analysis tolerances. Measures shingle thickness accurately and evaluate their level. Widely Applicable: Shingle gauge tool is perfect for assessing quality assurance levels for asphalt composite shingles, 3-tab fiberglass, 3-tab organic, and laminated shingle varieties. Convenient to Carry and Use: Shingles roofing with a built-in carabiner for easy carrying and a 5-inch ruler on the other side. High-quality: Pitch gauge roofing made with high-quality stainless steel, 3mm thickness, and high hardness for rust-proof and corrosion-resistant long-term use. Instructions for Use: 4/09 shingle gauge is only applicable to asphalt composite roof shingles installed before January 2011. 4/09 Shingle Gauge is the perfect tool for any roofing professional or homeowner looking for an accurate and reliable way to measure shingle thickness. This Shingle Gauge Tool is specifically designed with analysis tolerances to the most precise measurements possible. It's perfect for assessing quality assurance levels for types of shingles, including asphalt composite shingles, 3-tab fiberglass, 3-tab organic, and laminated shingles. Roof Pitch Gauge is portable and convenient, with a stainless steel carabiner that makes it easy to carry with you wherever you go. The other side of the gauge features a 5-inch ruler for added convenience. Made with high-quality stainless steel, pitch gauge roofing is durable and long-lasting, with 3mm thickness and high hardness for rust-proof and corrosion-resistant use. Colour:Silver Material:Stainless steel Package Contents: 2 * Shingle Gauges 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.