Haw. Rev. Stat. § 486-34

For the purposes of the effective enforcement of the respective parts of this chapter, proof of the existence of a measure or measurement standard in or about any building, enclosure, stand, or vehicle in which or from which it is shown that buying or selling is commonly carried on, shall, in the absence of conclusive evidence to the contrary, be "presumptive proof of the susceptibility of commercial use" of such measure or measurement standard.