The CPA Series of laboratory balances feature automatic internal calibration via an integrated calibration weight at the touch of the CAL key. Also, if the ambient temperature fluctuates outside of a user-defined range or after a pre-programmed time interval, the unique isoCAL function will automatically perform internal calibration and adjustments at regular intervals with consistently high accuracy. A bi-directional RS-232C interface port on all models assures easy communication with a PC, lab robotics and more. The high-contrast, backlit display offers outstanding readability under any lighting conditions, while the micro- and semi-microbalances operate without backlighting. The CPA series consists of twenty-nine models that range from microbalances to heavy-duty models with a weighing capacity of up to 34 kg.