Many of the time when people travels abroad the main issue is for their luggage weight. When you carry excess weight then definitely you have to pay more to the airline, so it is important to get accurate weight before leaving to the airport or you have to mess up the luggage removing your extra ones. Their is yet an another weight ruler which weighs your luggage and display you exact weightage.
The Gravity Ruler is the not exactly a device but it is a simple digital cord which you loop around your luggage, just tie the cord around and lift it up, the orange band on the cord scale moves displaying you the exact weight. So again an awesome technology mark up.