USPS PS100 10-Pound Postal Scale Electronic Digital Scale In 1 Lb Resolution & 1 Lb Minimum Weight Increment Mechanical Overload Protection & Tare Function Will Set Negative Weight To 0 Without Add-on Accurate To  0.1% of Reading &  Digit 4 Points Of Automatic Convenient postal scale for weighing items between 0 and 10 pounds 5.5-by-5-inch platform features fold-up top for weighing oversized pieces Tare function resets "zero" weight so you can easily weigh loose items Precise to within 0.1 of an ounce; easy-to-read 7-segment LCD display Runs on AC adapter (included) or 9-volt battery (not included); 1-year warranty