balance scale
A device for weighing. It has a balanced beam and two pans. When the pans contain exactly the same mass, the beam is in balance. One can place an object in one pan and standard weights in the other to find what the object weighs.
Don't use the Libra tag for this. That refers to the constellation and related symbology.
The following tags are aliased to this tag: balance_scales (learn more).
This tag implicates weighing_scale (learn more).