The compact, accurate DYMO M10 Digital USB Postal Scale weighs envelopes and packages up to 10 kg (22 lb). This scale is packed with great features ? including a ?hold? feature that locks the weight display for 10 seconds when the screen is obscured by a larger item, a tare function for accurately weighing items in a container, and an automatic shut-off that prolongs battery life. Free DYMO Scale Software. Display the scale weight on your Mac? or PC screen. Powered by 3 AAA batteries (not included) or USB cable (included) connected to PC or Mac?.