# 17-25-025

equality-of-contrast photometer

visual photometer in which parts of the test and comparison field are viewed simultaneously and are adjusted to equality of contrast

Note 1 to entry: This entry was numbered 845-05-21 in IEC 60050-845:1987.

Note 2 to entry: This entry was numbered 17-392 in CIE S 017:2011.

Publication date: 2020-12