The Waygate Technologies Krautkramer Dual Element Sliding Eddy Current Probe, Differential, a Baker Hughes business product (formerly GE Inspection Technologies), slides over rows of fasteners to detect flaws. The probe has a frequency range of 100 Hz - 500 kHz and boasts two microdot connectors. It also comes with 1.5 mm, 2.5 mm, and 3.5 mm shimes that allow it to accommodate different fastener sizes.