NiCr test pieces for liquid penetrant inspection will help you maintain your PT testing process by verifying penetrant sensitivity and performance. Use to check for penetrant deterioration, to compare different penetrants or to verify sensitivity or visibility. NiCr Test Panels are ideal penetrant sensitivity comparators. They come in pairs, with panel set crack depths available in 20 microns. Having matched pairs enables "in use" penetrants to be compared against "new, unused" penetrants, in order to determine if the penetrants are performing properly. The panels are ideal for monitoring fluorescent penetrant (ZYGLO) lines.