United States Postal Service PLUS20 USPS 20-Lb Digital Postal Scale

Features: 7-segment LCD display. Warm-up time is 3 min or less. Accurate to + 0.1% of reading & + digit. 4 points of automatic calibration for greater accuracy. Auto-off feature saves battery life after 6 min without use. Powered by ;AC Adapter (included) or 9V battery (not included). Electronic digital scale in 1 lb resolution & 1 lb minimum weight increment. Large 5" x 5" platform with fold-up platform top to weigh large letters 0-20 lb capacity. Mechanical overload protection & Tare function will set negative weight to 0 without add-on.