I agree with the meter reference, it's my best tool, I received the pocket spot recently after a long wait and used it at the workshop to determine zones and placement, my darkroom work will be a continuation of what I did in the field. Beyond the technical there is nothing greater than to develop and nurture visualization, the end goal of art.

Take a look at what Al Weber has to say about the Zone System and the real world as a point of reference. As you will read he worked with Ansel Adams for 18 years and his main focus was the perfection of the Zone System.