The GX-4000 balance features internal calibration. The internal calibration mass makes calibrating your GX Balance easy, even when you relocate or bump your balance. Just push a button! Fast, new Super Hybrid Sensor (SHS) gives you the ultimate in response speed . . . Just ONE second! Automatic Self-Calibration calibrates the balance when it detects changes in the ambient temperature. Large, bright vacuum fluorescent display. Percentage, Counting Functions & Comparator functions included. ACAI Counting Function for highly accurate counting. Weigh Modes: g, oz, lb, lb:oz, ozt, ct, mm, dwt, GN, TL, t, MS, PC, %, and DS. Weighing Cap.: 4100g / Min. Weighing Value: 0.01g / Linearity: 0.02g / Stabilization: 1 sec. / Pan Size: 6.5 x 6.5" / External Dimensions: 8.25" x 12.5" x 3". Other features include: RS-232C interface, data memory, standard underhook weighing, splash-proof keyboard, animal weighing mode and comparator function. Optional glass breeze break, animal weighing pan, printers and other accessories sold separately (see A&D Toploader Accessories category). A&D® Weighing #: GX-4000.