Check the listing for details. Digital Postal Scale Packages Electronic Postage Mail Parcel Weight Scale 50lbs. Color: Silver, Condition: New. Listed at 27.78 USD. Fold Up Mailer Holder-Stand upright to 90 degrees for rolling tubes and irregular packages.Use AC adapter, the scale will be always power on, Self-Calibration Technology: Does not require a 50lbs weight.Capacity-up to 50lbs; Sensitivity-0.1oz（0-25lb);0.2oz(25-50lb); Reading Modes-Pounds/ounces, ounces, kilograms/grams, gramsKey Functions-Tare(Allow you to reset the display to 0.0); Hold (Especially for Weighing a over-sized item)Self-Calibration Technology-Does not require a 50lbs weight. You can choose any known weight starting from 5 lbs for calibration purpose.Use AC adapter, the scale will be always power on Fold up mailer holder-stand upright to 90 degrees for rolling tubes and irregular packages, capacity-up to 50lbs, sensitivity-0.1oz0-25lb), 0.2oz(25-50lb), reading modes-pounds/ounces, ounces, kilograms/grams, grams, key functions-tare(allow you to reset the display to 0.0), hold (especially for weighing a over-sized item), self-calibration technology--does not require a 50lbs weight. You can choose any known weight starting from 5 lbs. for calibration purpose., Power- run on 3 x AAA batteries or 5v adapter (both included).