This blue thread gauge is essential for any 3D printing enthusiast or DIY mechanic. Equipped with precise threaded holes in both metric (M3 to M12) and imperial (UNC 1/8 to 1/2) sizes, it is ideal for verifying bolt compatibility prior to assembly. Its compact and durable design makes it convenient to carry and use anywhere. Whether you are conducting Troubleshooting on a print or fabricating custom hardware, this tool guarantees accuracy every time. Thread Gauge 2 – your dependable partner for all threading tasks.