I think this application is very useful especially in lab activity. This is the smart phone application that measures a wide range of phenomena, including pH, temperature, force, carbon dioxide level, and more. This can be a great substitution for some of the devices in the lab such as termometer. What I really like about is it can also measure carbon dioxide level. When is there a lesson about global warming, students can measure the CO2 levels of thier neighbor area and do the application laboratory activity. Students also can draw graph with this app, so that they can measure CO2 levels of different area and draw graph about it. There is anylyze data function. and it can help students to analyze whatever data that they have collected. Only concerns is I am not sure if this device need some kinds of connection in order to measure CO2 level or pH level.