Thanks for the tutorial on the electronics n workings of the meters. Firtst thing I did when I got her was open it up n clean everything inside n out top to bottom. It is facinating the sensor has 3 color gels CYM n when you turn the dial to each channel it moves the window to that particular gel over the sensor diode tube.. white has no gel of course... such an elegant n simple solution.

What I'd like to know; what are the real world values of say the Y chanel when set to G then null tuned to 20 on the second dial? G-20 has no transaltion to anything I am familiar with in terms of density or CC values. Does the manual deal with that at all?