Download the trial first to see if the app works on your phone, email me if you have any issues regarding changing values, etc.A complete Incident + Reflected Light Meter, measured to be as accurate as hand-held devices, packaged with other essential photography tools.NEXUS 4 USERS:There appears to be an error in the camera hardware/software API, press the preview TWICE (while framing the subject) to get an accurate reading. I am researching as to whether it is possible to circumvent this issue.Light Meter Tool is is an application for photographers to measure reflected and ambient light using their Android cell phones, developed by a photographer with too much equipment to carry around. It uses two different methods to measure light: the light sensor and the phone