beam balance
noun [ C ] engineering specialized uk/ˈbiːm ˌbæl.əns/ us/ˈbiːm ˌbæl.əns/ (also beambalance scale)
杠杆称（用于测量重量的工具，将所测物放入杠杆一端的托盘中，并用另一段的重物加以测量）
a device for measuring the weight of something by putting it into a small dish that hangs from one end of a straight bar and balancing it with weights at the other end