Ruler: Measure CM, MM & Inches

The only physical ruler engineered to universally adapt to any screen size with guaranteed 1:1 actual-size accuracy. Unlike ordinary ruler apps that lose precision across different devices, "Ruler: CM, MM & Inches" features an intelligent hardware display adaptation engine. Whether you are using a compact screen, the largest Pro Max, or a giant iPad tablet, 1 centimeter on your screen is strictly 1 centimeter in the physical world. UNIVERSAL ADAPTIVE PRECISION: • Adapts to Any Screen Size & Aspect Ratio From compact phones to large-screen devices and iPad tablets, our advanced display geometry engine automatically maps your screen’s native hardware dots-per-inch (DPI) for flawless real-world fidelity. • Guaranteed 1:1 Actual Size No camera distortion, no AR scanning lag, and no complicated setup. Just place your object directly on the glass and measure with real-world physical certainty. • Dual-Edge Simultaneous Measurement Metric scale (cm & mm) along the left edge, Imperial scale (inches with 1/16" graduations) along the right edge—always visible at the same time. • Precision Caliper Mode (Pinch to Measure) Activate dual adjustable caliper jaws with live dimension arrows and real-time thickness readouts. Perfect for measuring coins, screws, jewelry, and hardware parts. • Universal Card Calibration Verify or fine-tune your device’s accuracy anywhere in the world using any standard credit, debit, or ID card (ISO ID-1 standard 53.98 mm). • High-Contrast Dark & Light Themes Switch instantly between a glare-free OLED dark mode and an ultra-sharp, high-contrast black-on-white theme designed for outdoor visibility. • 100% Offline & Private Measure anytime, even offline, with no sign-in required. Your pocket ruler is always ready when you need it. From DIY crafts and carpentry to daily household measuring, carry a certified actual-size ruler tailored to your exact screen.