a weighing scale
This instrument is a balance.
A balanced scale, which compares the mass of one object with that of a known quantity.Balance scale. Measures "weight" on Earth, but the result is easily converted to Mass.
mass. That scientific, or laboratory instrument, is usually called a Beam Balance.
A spring scale measures weight.
a scale
weight and mass measures the volume
a beaker
weight
spectrometer spectrometer
it is called a knife
That depends on whether you want to measure its weight, radius, mass, color, albedo, roughness, eccentricity, temperature, or the pressure of the air in it. Each of those measurements takes a different instrument.
A balance scale measures mass. A scale measures weight.