This paper uses data from the OECD's 2015 PISA and an endogenous treatment effects model to investigate the impact of different intensities of digital device use for academic purposes on science learning outcomes. When we do not differentiate the location of device use, we find that greater use can help students improve their science scores in most of the countries. When we consider school and outside-of-school use separately, we find the above positive results are driven by outside-of-school digital device use and that there are more negative results of increased device use at school.