Lewis & Short

lībrĭpens, pendis, m. [libra-pendo].

  1. I. One who weighed or counted out the pay to soldiers, a paymaster, Plin. 33, 3, 13, § 43: impubes libripens esse non potest, Ael. ap. Prisc. 892 P.
  2. II. One who held the balance, as if to weigh out money, at nominal sales: adhibitis non minus quam V. testibus civibus Romanis puberibus, item libripende, Gai. Inst. 1, § 113; Ulp. Fragm. 19, 3; cf. Plin. 33, 3, 13, § 43.