Have you ever thought to yourself, "Gee, I need a functioning optical mouse that also doubles as a scale with it that weighs up to 500g with a 0.1 degree of accuracy?" Presto! That thought has now been made manifest with this handy little item that operates via USB and requires no batteries (the USB cable charges the scale). Backed by a 10-year warranty, the standard two-button mouse with scroll wheel also boasts a back-lit LCD display screen, and the included weighing tray is made of stainless steel.  Now if they could just make it wireless and play MP3s ...