Use a coin or credit card to calibrate a ruler anywhere, you don't have a real ruler with you!
- No ads, for real, forever!
- Choice of measurement units: fractional inches, decimal inches, centimeters or millimeters
- calibrate the ruler with a credit card to start anytime, anywhere
- Don't have a credit card with you? Calibrate your ruler with a coin!
- calibrate your ruler with a real ruler for maximum accuracy when transferring measurements
- manually set the ruler to a known length for accurate measurements
- Night mode to save battery and relieve eyes at night
- Save your measurements for future use
- No permission required