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Do you suddenly get the urge to know how much something weighs, down to the decigram? If so, we have the perfect gadget for you: a mouse that also doubles as a precise scale.
The mouse functions as a regular two-button, USB mouse until you open its cover, which reveals a precise scale with a range of 0.1 to 500 grams -- perfect for weighing small objects, which probably abound on your desk.
If you think that the mouse-scale combination is a bit preposterous, you can always remove the scale from the mouse and let it do its thing on its own.