A simple, user-friendly and accurate ruler for your phone. Use a coin or a credit card to calibrate the ruler anywhere, when you don't have a real ruler with you. Ad free, for real, forever. Pick your units: fractional inches, decimal inches, centimeters or millimeters- Calibrate your ruler with a credit card to get you started anytime, anywhere- Don't have a credit card with you? Calibrate your ruler with a coin. Calibrate your ruler with a real ruler to achieve the best precision in your measurement transfers- Manually set the ruler to a known length for accurate measurements - Night mode to save battery (on AMOLED screens) and to relieve your eyes at night- Save your measurements for future use- No permission requiredUpdate history:3. 5. Millimeters, set to predefined length3. 3. Calibrate with a credit card, remove saved measurements from history3. 2. Fractional display of measurements in inches3. 0. Android Material theme and new scale for measurements in inches2. 1. Calibrate with a coin, default calibration button (reset) 2. 0. You can now save your measurements1. 7. Night mode to save battery and/or read more easily at night1. 6. Added default calibration for common devices (Nexus series, Galaxy S series, Galaxy Note 1, 2 and 3).