1. Safety when driving better protection: Chain wear condition is crucial for driving safety and bicycle functionality. You need a professional tool to assess the chain wear condition. Our bicycle chain gauge is compact with dimensions of 125 x 43 mm, making it easy to carry, yet it maintains precision. This allows you to accurately and promptly determine the chain wear condition, ensuring a safe cycling experience. 2. Easy to use: The chain gauge is simple to operate. It features two wear measurement scales (0.75 and 1). Simply insert the gauge end with the wear scales into the gap between chain links to check the wear condition. If the gauge cannot fit into the chain, it indicates good condition. At 0.75, the chain should be replaced, and at 1, you must the chain immediately. 3. : The chain tester is made of durable stainless steel, ensuring hardness, sturdiness, and resistance to breakage. The stainless steel material is also rustresistant, easy to clean, and suitable for outdoor use. 4. 3 functions in 1 chain tester: Our stainless steel chain tester not only includes wear measurement scales but also features scales for screw length and diameter measurement. Additionally, the bicycle chain gauge comes with two chain hooks. These hooks allow you to securely hold the chain during repairs, making the process easier.