densitometer

noun
UK /ˌdɛnsɪˈtɒmɪtə/
US /ˌdɛnsɪˈtɑːmɪtər/

A densitometer is a tool that measures how dark or how thick something is.

The scientist used a densitometer to check how dark the film was.


OTHER MEANINGS

2. A device that measures the optical density of photographic or printed material.

The printer used a densitometer to keep the colors consistent.

3. An instrument that measures the density of a liquid or gas.

The lab technician tested the fuel with a densitometer.

4. A tool used in medicine to measure bone density.

The doctor used a densitometer to check the patient's bone strength.