Convergence devices are all around us. Your cell phone likely has a camera in it. Your portable GPS device might have a Bluetooth speakerphone. And this USB optical mouse has a digital scale in it.

This has to be one of the stranger spins on convergence, as I would never have thought to combine these two functions. On the surface, this looks like any other generic computer mouse. It has two buttons and a scroll wheel in the center, along with the USB cable for connecting to your computer.

Remove the cover toward the rear, however, and you discover a fully functional digital scale. It’s not going to weigh you, but it could come in handy for little trinkets. The scale only goes up to 500 grams, but it can also display weights in oz, gn, or ct. In this way, it might be handy for jewelry stores, for instance.

You can find the USB Optical Mouse with Pocket Digital Scale at Brando.com for the reasonable price of $22. Strangely, the scale appears to need its own AAA batteries, not running off of the supplied USB power.