Screen Ruler: Phone Measure

📏 Screen Ruler — turn your phone into a pocket measuring tape Need a quick length when you don’t have a ruler? Screen Ruler puts millimeter ticks on the edge of the display. Drag the orange guides to the object, read the span, and copy the result. Calibrate once with a bank card so the scale matches real-world mm/cm/in. No accounts and no cloud — the ruler and your calibration stay on the device. 🔊 How it works 1️⃣ Place a bank card on the screen and match the orange ▲ ▼ to its short edges 2️⃣ Save calibration (or skip and use an estimate) 3️⃣ Drag the guides to the object you want to measure 4️⃣ Switch mm / cm / in and copy the reading ⚠️ Best results after card calibration. Phone DPI alone is often wrong — a real bank card (ISO ID-1 short side ≈ 53.98 mm) is the reference. 🛠 Key features 🟠 Aluminum + tape-style edge ruler 📐 Drag ▲ ▼ measure guides 💳 Bank-card calibration saved on device 🔢 Units: mm, cm, inches 📋 Copy measurement 🔄 Reset guides / recalibrate ⚙️ English and Russian 📴 Works offline after install 🏠 Perfect for ✔ Quick DIY and craft sizes ✔ Checking small parts when a tape is elsewhere ✔ Comparing lengths side by side on the screen ✔ Everyday mm/cm checks at home or at the desk ⚠️ Important notes Does NOT replace a certified measuring instrument Does NOT claim laboratory accuracy without calibration Does NOT measure distance with the camera — on-screen scale only Accuracy depends on your calibration and how flat the object sits against the glass 🔐 Privacy first 🔒 No accounts 🔒 Calibration and preferences stay on-device 🔒 No cloud required for measuring 📱 Screen Ruler — a clear on-screen scale when you need one