Sherwin Incorporated manufactures the "Penetrant System Monitoring Panel" to provide a quick means of determining the continued serviceability of liquid penetrant inspection systems: fluorescent or visible; water-washable; post-emulsifiable, or pre-wash.

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A pair of nearly identical panels measuring 2 x 6 inches and 0.090 inch thick with matching crack patterns.

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The 1.5 x 2 inch panel is made from 16 guage 301 or 302 stainless steel by grit blasting with 80 mesh aluminum oxide grit and 60 psi of air pressure.

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A stainless steel panel measuring 4 x 6 inches and 0.090 inch thick with two parallel, "medium rough" strips, each 6 x 1 1/2 inches seperated by a smooth 1 inch strip.

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A set of two panels, each measuring 3.875 x 1.875 inches (100 x 35mm), sheared from the same stock with matching crack patterns.

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