Waygate Technologies FH2E [113-552-005] Fingertip Probe, 7.5 MHz 0.38 Inch Contact Dia. With Potted Cable. Waygate Techologies FH2E Fingertip Probe, a Baker Hughes business product (formerly GE Inspection Technologies),has a frequency of 7.5 MHz, 0.38" Contact Diameter, and a Potted Cable.