Adam CB [CB 501] Compact Balances With External Calibration, 500g x 0.1g. The Adam Equipment CB 501 500g CB Digital LCD Compact Balance can manage most small tasks, such as measuring compounds in chemistry classes, portioning at food service establishments, or weighing small animals. Compact and portable, the CB can easily be transported to the field, or from bench to bench in a science classroom. The CB is powered by battery or an optional AC adapter. A sealed keypad and one-piece housing make the CB simple to clean. The grade 304 stainless steel pan can be wiped down quickly and accommodates either single items or bulk powders.