WeighMax 75 lbs postal scales were designed for weighing both letters and packages. With an accuracy of 0.2 ounces, it is fully capable of weighing first class letters for the post office. These digital postage scales feature mode switching, tare and hold buttons for your convenience. It also auto-hold the weight after a package has been placed on it, so you never lose sight of it when doing your postage labels. Batteries and an AC adapter included. All Weighmax products are backed by a lifetime warranty.