The trade approved scale PCE-SD ... CR series is designed for applications in many processes and delivery businesses, since the trade approved scale supports many interfaces. Furthermore the trade approved scale features a standard RS-232 interface. In addition the trade approved scale PCE-SD CR series can be equipped with further interfaces which enable control of the trade approved scale. For example, the trade approved scale can be extended with an analogue output 4-10 mA or 0-10 V, or even potential-free contacts. The roller scale is calibrated and thus can be used for tasks in areas of custody transfer. The trade approved scale can be also integrated into larger rollers, and hence can be used as an extension module.