I bought this scale last year just before my European trip and found it extremely helpful.  Now, if I'm flying anywhere, I take this little gizmo with me.  It is easy to use.  With the luggage on the floor, insert the belt of the scale through the handle and wait for "0.0" to appear before lifting the luggage.  When the weight is stabilized, it will beep.  If you want to change the weight to kg instead of lb, just change it when the display shows "8.8.8" and press the button.  This will allow you switch between the two different weight modes.  It's great that I no longer have to wonder if I'm over 23 kg (50.6 lb) on my luggage.  One of the best investments I've ever made!