Good news, I am finished with the USB Par meter and can deliver it to CNC or other convenient place. Yes, I am happy to cough up the $50 I owe. Still need guidance with the Club paypal account.
Let me share my experience for new users. I tried to get a definitive reading for various spot throughout my tank. This proved impossible since I discovered that the slightest change in angle, shadow of your arm, 1/2" movement, gives a wide range of results. So I now am just looking for an approximate range of reading for the general spots I am interested in. Guess this is why the experts say to be ready to move the frag until it is happy.