Gossen Mastersix

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The 1983 Gossen Mastersix (in US Ultra-Pro) is the first microprocessor controlled light meter made by Gossen and replaced the earlier Profisix / Lunasix F range of professional meters. The Mastersix continued the "system" meter line of the Profisix, accepting the same range of electrically connected accessories for extended functionality such as colour temperature and enlarger measurement. The system line of meters ended with the Mastersix.

The meter provides incident and reflected measurement for both ambient and flash light, with additional measurement possibilities using accessories.