Here’s a unique dual use mouse- it’s a standard USB optical mouse that flips open to reveal a digital scale inside. The $50 Optical Mouse & Digital Scale from American Weigh has a 500g (17.635oz) weight capacity for the scale portion with readability to .1g (0.005oz). The scale has a removable cover that flips upside down to become a tray for weighing things. There’s also an internal rechargeable battery if you want to use the scale without being hooked up to the USB cord.
Kinzi Precision Digital Bathroom Scale w/ Extra Large Lighted Display, 400 lb. Capacity and "Step-On" Technology [2016 VERSION]