I have had several. The first one used the old paper screnes. Then I had the shooting Chrony. It worked well and sisde by side I got the same readings as much more expensive machines. Like Handloader one, I now have the pro Chrony. Its the best I have used. It is not sensitive to light changes but works at its best on cloudy days. Its not expensive. I think mine was 125 dollars about ten years ago.