Waygate Technologies TC560 [113-544-214] TopCOAT Probe, 5 MHz 0.63 Inch Contact Diameter. The Waygate Technologies TC560 TopCoat Probe, a Baker Hughes business product (formerly GE Inspection Technologies), has a 0.63" contact diameter and a frequency of 5 MHz. This probe is ideal for use with the DMS2 and DMSGo. The KBA531A  armor jacketed probe cable is required.