If you oversee First Class, Priority and Express Mail, this scale will accurately determine rates for parcels up to five pounds. Also offers a protective lens with easy-to-read numbers. Larger capacity for heavier items. Intended for private use only; not legal for trade. Electronic/Mechanical: Mechanical; Scale Type: US Natural Scale (1:37,900,000), World Natural @ Equator; For Carriers: USPS; Increments: 0.5 oz.