010-15 Wyo. Code R. § 15-7
(a) The Wyoming standards for quality of shell eggs contained in this chapter only apply to eggs that are the product of the domesticated chicken hen and remain in the shell.
(b) Interior egg quality specifications for these standards are based on the apparent condition of the interior contents of the egg as it is twirled before the candling light. Any type or make of candling light that will enable the grader to make consistently accurate determinations of the interior quality of shell eggs may be used. The grader shall break-out an occasional egg and compare the broken-out and candled appearance to aid in correlating the candled and broken-out appearance by determining the Haugh unit value of the broken-out egg.
010-15 Wyo. Code R. § 15-7