Waygate Technologies DA512 [113-552-013] Thickness Probe, 7.5 MHz, Range 0.6 to 60 mm in Steel w/ Potted Cable. The Waygate Technologies DA 512 Probe, a Baker Hughes business product (formerly GE Inspection Technologies), has a frequency of 7.5 MHz and a range of 0.6 to 60 mm in steel. This probe also has a potted cable.