Imperial Tintmeter Pattern Exposure Meter

Black leather 'Z' folded pamphlet, inside there are plastic inserts attached which explain how to calculate exposure times and contain sensitised paper for gauging light levels. On one side the pamphlet is used to calculate exposure times in bright light, and on the other side the calculations are for dull light. Both sides have plastic sliding scales which can be moved to assist with the calculations. Both sides also have paper inserts which can be moved to expose the sensitised paper, there is a clear circular window through which the paper is exposed.