Quick Answer: The Nicholson Hydrometer is a nickel-plated brass hydrometer of the constant-volume, variable-load type, with a hollow cylindrical float, an upper loading pan and a weighted sinker. It measures the specific gravity of liquids and of solids both heavier and lighter than water.
Last updated: October 2026
Key Features
Heavy-gauge brass, nickel plated against corrosion
Hollow cylindrical float with a weighted sinker bulb
Upper and lower pans for the specimen and weights
Loading stem carrying the upper pan
Measures specific gravity of solids and liquids
Technical Specifications
Specification
Value
Material
Brass, nickel plated
Type
Constant volume, variable load
Parts
Hollow float, weighted sinker, upper loading pan, lower pan
Measures
Specific gravity of solids (heavier or lighter than water) and liquids
HS code
9025.80
About This Product
Weights are added to the upper pan until the hydrometer floats at its fixed mark, then the reading is repeated with the solid on the upper pan and again in the lower pan under water. Comparing the loads gives the mass of the solid and the upthrust on it, and so its specific gravity.
Frequently Asked Questions
Can the Nicholson Hydrometer measure solids lighter than water?
Yes. It measures the specific gravity of solids both heavier and lighter than water, as well as of liquids.
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