The Collaborative International Dictionary of English v.0.48:

Weighing \Weigh"ing\,
   a. & n. from Weigh, v.
   [1913 Webster]

   Weighing cage, a cage in which small living animals may be
      conveniently weighed.

   Weighing house. See Weigh-house.

   Weighing machine, any large machine or apparatus for
      weighing; especially, platform scales arranged for
      weighing heavy bodies, as loaded wagons.
      [1913 Webster]

WordNet (r) 3.0 (2006):

weighing machine
    n 1: a measuring instrument for weighing; shows amount of mass
         [syn: scale, weighing machine]