Waygate Technologies Alpha 2F [113-526-000] 10 MHz 0.38 Inch Contact Dia. Contact Probe Requires C-604 Cable.The Waygate Tchnologies Alpha 2F Contact Probe, a Baker Hughes business product (formerly GE Inspection Technologies), has a 0.38" contact diameter and a frequency of 10 MHz. This probe also requires the C-604 probe cable.