The ACE-100 is a super-sensitive small scale that lets you weigh each component, each stick, so you can keep track of weight as you are building your model plane or bridge, and modify the parts before you install them. Repeatability is excellent: we found it to be within .03 g maximum across a small sampling of our first shipment. Accuracy seems excellent, too: We measured the weight of a paper clip on 4 scales at .44, .43, .44, and .45 g.
We are now shipping the USB-ACE-100 with a 100g standard calibration weight. Your new USB 100g scale is factory calibrated, but it may require re-calibration if it is dropped, subject to rough handling, or a heavy weight is placed on the pan. Without an accurate 100 weight, your scale is out of service until you can get one. Be aware that the ACE-100 is so sensitive that gently breathing on it from a distance of a foot will change the reading! ACE-100 Specifications: * Scale is built in to a hardshell case measuring 5" x 3" .75" closed. * Power: 2 AAA batteries (included) *Auto Shutoff after approx. 1 minute inactivity. *Weight platform: 2.5" x 3" *Functions/controls: On-off, Tare, Mode (g, oz, gn, ct), Calibration *5-year limited warranty