I know it can be used without calibration Jeff I did a lot of research before buying my last light meter, but the point I was trying to make was it can be calibrated for individual films as well digital sensors with the test target, but If you aren't going to use the calibration facility, the Gossen Starlte that has a specific Zone facility, which is what the original question was about, is the most suitable for the OPs requirements and IMO the Gossen is a better buy.