The following links to the subject matter. While I copied this application in my android tablet and phone, I found a number of android applications useful for safety professionals, like checklists, API pressure vessel questions, dangerous goods manual, physics equations, chemistry equations, heat exchanger, cylindrical tank volume, valves, sound meter, light meter, speed meter, HSE news, etc. And all these and many more are free.
http://www.cdc.gov/niosh/updates/upd-06-17-13.html