A Westphal (or Mohr) balance.
A flotation raft or object of science, non raft. ETC.)
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A hydrometer is an instrument used to measure buoyancy by determining the density of a liquid. It can be used to measure the specific gravity of a liquid and infer its buoyant force.
An anemometer is the instrument that measures wind direction using a wind vane.
lectometer
a scale
an 'ammeter'
a dendrometer is used to measure trees.