Guildline’s NEW 6645Q Quantum Hall Resistance System has been designed and developed to meet the needs of Standards Laboratories around the world for an improved level of accuracy in the calibration and maintenance of primary resistance standards.

Guildline Instruments 6640Q Quantum Hall Resistance DCC Bridge has been designed to provide better uncertainties and more operational capability in Direct Current Comparator (DCC) Resistance Bridges used with Quantum Hall Resistance Systems (i.e. QHRs).