IPA: /səˈlɒmɪtə/
KK: /səˈlɑːmɪtər/
An instrument used to measure the amount of salt in a liquid solution.
The scientist used a salometer to determine the salinity of the water sample.
Salometer → It is formed from "sal" (from Latin *sal*, meaning salt) and "-meter" (from Greek *metron*, meaning measure). A salometer is an instrument used to measure the concentration of salt in a solution.
Think of 'salt' ('sal') being measured ('-meter') — that's how a salometer works.