Gamma Scientific Model 721 linear photometer, a precision instrument designed to measure light intensity and brightness levels with high accuracy. Manufactured by Gamma Scientific Incorporated, the unit was used in laboratories, photographic studios and industrial research environments for calibration of lighting, optical equipment and display systems. Housed in a portable case with probe and analogue meter, it reflects professional optical testing practice prior to digital light meters and computerised measurement systems; 1960s–1970s.
W40 x D23 x H16 cm.
Untested.
