I stopped using charging cylinders when the scale technology made charging cylinders obsolete and thank you, you make a good point. Change is needed when technology provides better methods. Evacuation technology has changed and I changed with it. Many other technologies have made service and the industry in a whole serve the customer better. IAQ and Airflow monitoring are a few developments that have changed our industry in general ands how equipment is controlled. I guess the only thing is someone eager to spend money on equipment that doesn't actually make you do your job better. I also agree with you if this is what was used in school then it is the way one would want to continue. Hard to believe they supply digital gages in school but believe it or not we used slide rules in our class, to teach us to interpolate.
ckartson
I didn't write the book I just read it!