I've, somewhere on my discs at home instructions for the D102 and D104.
Contact me privatelly (as a reminder) and will search for you.
Usage is straitforwad.
There is a switch to go in reflexion or transmission.
For transmission you've to put the neg in a light table, and measure it by pressing the button on the head.
fr reflexion, pressing the button on the head, the measuring light will come on and the D102 will make the measurement.
There are multi turn adjustable resistors to calibrate the unit, and that's all