N.J. Stat. Ann. § 34:11-56a12

The commissioner and the wage board in establishing a minimum fair wage, shall not be bound by technical rules of evidence or procedure, but may consider all relevant circumstances affecting the value of the service or class of service rendered; may consider the wages paid in the State for work of like or comparable character by employers who voluntarily maintain minimum fair wage standards; and may be guided by like considerations as would guide a court in a suit for the reasonable value of services rendered at the request of the employer without agreement as to amount of wages to be paid.