One hand and a just a few taps on the screen is all it takes to get the info you need.
Are the recommended selections not exactly what you’d prefer? Go ahead lock a selection in, select another, and Lghtmtr will readjust the last metric for you.
One of the more frustrating parts of learning how to use your analog camera is learning the relationships between shutter speed, the aperture, and the ISO settings. Lghtmtr helps take the guess work out until you have mastery over this knowledge.