Thread Pitch gauge is in the 1st set of the Smart Tools collection. How did you determine thread pitch of screws? With a paper or a ruler? From now on, you can measure them with this app. Usage is simple. Open the app and measure thread on your screen. Is it accurate? Don't worry. The width of your screen was already calibrated. * Supported thread list: - Metric thread sizes - US thread sizes - NPT (National Pipe Tapered thread) - BSPT (British Standard Pipe Taper) - Metric Screw sizes - SAE Screw sizes * Main features: - Caliper mode - Meter <-> Inch - Background color - Material design * Do you want more tools? download [Smart Ruler Pro] and [Smart Tools] package. For more information, watch YouTube and visit the blog. Thank you.