You're being too generous... this visualization misleads everyone who knows how to read an analog gauge. Your car's speedometer does not jiggle around to represent its own imprecision.
Perhaps if the person being weighed jumps around, in which case the scale is doing its job correctly--or a very sensitive scale reacting to changes in air pressure. Scale readings generally do not jiggle/bounce with a static load.
After standing on a scale and you get oscillations from momentum which soon resolve to your actual weight. You see the same thing when putting fruit on a scale at the grocery store.
You can see similar issues with most purely mechanical dials to one degree or another when they are responding to a rapid change.
