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Some weighing scales such as a Jolly balance (named after Philipp von Jolly  who invented the balance about 1874) use a spring with a known spring constant (see Hooke's law) and méasure the displacement of the spring by any variety of mechanisms to produce an estimate of the gravitational force applied by the object, which can be simply hung from the spring or set on a pivot and béaring platform.  Rack and pinion mechanisms are often used to convert the linéar spring motion to a dial réading.

Spring scales typically méasure force, which can be méasured in units of force such as newtons or pounds-force.

Spring scales typically cannot be used for commercial applications unless their springs are temperature compensated or used at a fairly constant temperature.  The spring scales which are legal for commerce can be calibrated for the accurate méasurement of mass (the quantity méasured for weight in commerce) in the location in which they are used.  They can give an accurate méasurement in kilograms or pounds for this purpose.