A proportioning system, comprising at least one tool, a programmable electronic storage device disposed on the tool, a proportioning device including a device for releasably mounting the tool, a device for actuating the tool, and a device for controlling of the device for actuating the tool and/or device for releasably mounting it, and a device for contacting connected to the device for controlling and disposed on the proportioning device and another device for contacting disposed on the tool that is connected to the programmable electronic storage device wherein the device for contacting and the other device for contacting contact each other when the tool is releasably mounted on the proportioning device.