Rolling Ruler allows you to measure horizontal distances by flipping your device simply with surprising accuracy. Features1. Simple: Just flipping your iOS device.2. Support All: All of iPhone, All of iPad, iPod Touch 5G/6G.3. UnitInches, feet, centimeters, meters.4. Tipsvoice, help info, video, you can get it easily.5. CleanNO ADS, NO IAP, NO internet connect, NO background refresh. [Operating Method]1. Align iOS device at thebeginning of object whatever you want to measure, tap the top button to select a unit, tap START button.2. Continue flipping the device from one end of the object to the other. Rotate device carefully, dont slip.3. Reaching the end, align the top front-facing edge with the end of the object.4. Tap STOP buttonor keep the device still for 5 second, the measurement will stopautomatically, and the App will vibrate and speak the result to you.[Attention]1. The app just design for the horizontal distancess measurement.2. You must flip the iOS device vertically.3. Rotate your device carefully, dont slip.4. Please keep the straight line direction.5. Its very unlikely that the object is evenly divisible by your devices height. So, when you reach the end, align the top front-facing edge with the end of end of the object.If theres nothing vertical to lean the device on, use your best judgment.6. Although there is afinish button, its not always accessible, and sometimes you need to focus on keeping the device at the proper angle. If youcant tap thefinish button (not always accessible), just keep the device still for 5 second, the measurement will stopautomatically, and the App will vibrate and speak the result to you."Rolling Ruler gathers no moss either as it speedily and accurately measures everything and anything you want. No need to carry around a tape-measure when furniture shopping/ apartment hunting etc, just use your phone." --- AppGratis.comTo see it in action, there is a video: http://kienlhi.lofter.com/post/659fa_7a2f1e1Please feel free to get in touch if you have questions, feedback, suggestions, etc: firstname.lastname@example.org.I'd love to hear from you. And please leave an honest review. Thanks, and enjoy!