Photometer
A photometer is an instrument for measuring photometric quantities such as luminous flux, illuminance, or luminance. Historically, photometry was done by estimation, comparing the luminous flux of a source with a standard source.
A photometer is an instrument for measuring photometric quantities such as luminous flux, illuminance, or luminance. Historically, photometry was done by estimation, comparing the luminous flux of a source with a standard source.
A photometer is an instrument for measuring photometric quantities such as luminous flux, illuminance, or luminance. Historically, photometry was done by estimation, comparing the luminous flux of a source with a standard source.
Source: Wikipedia "Photometer" · CC BY-SA 4.0
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