State-of-the-art vacuum gauges for laboratory and industrial operation have to meet high standards in terms of gauge head resistance to chemicals, reliability in rugged applications and operator-friendly interfaces. VACUUBRAND has a comprehensive range of electronic measuring instruments for the range of atmospheric pressure to 5 x 10-9 mbar. A lot of applications in the laboratory call for electronic vacuum control, that is, constantly adapting the pumps volume flow rate to process requirements. The maximum volume flow rate of the unregulated pump can be changed in various ways:by cyclically turning the pump onoff (with CVC 3000 controller with module VMS-B)by cyclically openingclosing an in-line solenoid valve (CVC 3000) orby changing the pumps motor speed continuously (VARIO pumps in connection with CVC 3000)