The parts of triple beam balance are identified as the following. Before using triple beam balance, the scale pointer should be at zero. In old days, weighing was done with a beam balance to make equal splits. Triple beam balance is an instrument used to measure mass very precisely. The triple beam balance is an instrument used to measure mass very precisely. A Beam balance (or Beam scale) is a device to measure weight or mass. The beam balance, however, has the significant disadvantage of requiring suspensory strings, chains, or rods.