Most easy, practical, smart and innovative postal scale, the A-PT50 Digital postal scale is designed to meet various mailing and shipping needs, from a 0.2oz letter to a 50lbs package; improved Large display with energy saving LED backlight allows you to read numbers even in the dark; battery powered option enables you to weigh packages at any time any place; choose a preferred unit from different modes: pound/ounce, kilogram and ounces; smart tare And hold feature; worried about the accuracy of the scale after a long time use? See the innovation in this scale: you can do calibration by yourself choosing any knowing weight from 5lbs. Manufacturer Calibrated out of the box; 10 year manufacturer warranty.