Xalpha Lab Ruler

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!

FEATURES

• 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 required