Scale Ruler

A simple, user-friendly and accurate ruler for your phone!

Use a credit card to calibrate the ruler anywhere, when you don't have a real ruler with you!

- Pick your units: fractional inches, centimeters or millimeters

- Calibrate your ruler with a credit card to get you started anytime, anywhere

- 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

- Save your measurements for future use

- No permission required