The Agilent / HP 5061A Cesium Beam Frequency Standard is one of the best-known references. Output signals of 5MHz, 1MHz and 100kHz selectable. In addition to the HP 5061A, the delivery includes the power supply shown. The frequency counter and measuring cable shown are not included in the scope of delivery. The device, the tube and the external appearance are in excellent condition. The device is used, checked O.K.