microdensitometer

[ mahy-kroh-den-si-tom-i-ter ]
/ ˌmaɪ kroʊˌdɛn sɪˈtɒm ɪ tər /

noun Photography.

a densitometer for measuring the density of minute areas of photographic negatives.

Origin of microdensitometer

First recorded in 1930–35; micro- + densitometer