- densitometer - a measuring instrument for determining optical or photographic density
--1 is a kind of measuring instrument, measuring system, measuring device
--1 has particulars: microphotometer- densimeter, densitometer - a measuring instrument for determining density or specific gravity
--2 is a kind of measuring instrument, measuring system, measuring device
--2 has particulars: dasymeter - densimeter, densitometer - a measuring instrument for determining density or specific gravity