The S100 and S250 minimum weight that can be read is 1 LB. The S400 minimum weight that can be read 2.5 Lbs.

Weigh items up to 100 lbs (45 kg) with this heavy-duty, portable digital scale
Carry the scale to heavy packages, not vice-versa, with convenient built-in wrap-around handle
Utilize the detachable LCD screen for handheld or wall-mounted viewing
Connect via USB cable PC or Mac® to use popular online mailing and shipping services - including Endicia® InstaRate and DYMO Stamps® software
Take advantage of convenient hold, tare and automatic shut-off functions