Weighs in grams, ounces, pennyweight and carats. Fold-up plastic cover protect keyboard and display. Has a separate draft shield which folds up. Comes with a small tray for holding stones, a small scoop, tweezers and a 10 gram calibration weight. Uses 3 AG13 batteries which are included or can be powered with the supplied USB cord, which is plugged in a computer. Comes with a soft protective case. Precise to .001 carats. Precision Diamond Scale