a refractometer
Hydrometer
It is actually a salinity meter
Hydrometer is the most common tool used to measure salinity levels.
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Well i know that some dissolved oxygen instruments can measure salinity and altitude:)
The Salinometer or the Barometer is used to measure the salinity of the Ocean water.
We can use a conductivity meter (salinometer), a densimeter or for exact results analytical chemistry instruments for the determination of sodium.
Salinity
Ruler, scales (kitchen), scales (bathroom), measuring jug (kitchen)
A simple answer is impossible: it is a brochure ! Read a book of metrology.
Salinity is a measure of the saltiness of water.
Scientists use measuring instruments whenever the can because everything cannot be observed by the senses so measuring instruments are needed instead.