Author Comment Last activity Moderation
omarormachea "Dear @TeacherHelen, you can use the following free software created for android platforms, you can get information about it, from the calibration a..." | Read more » over 2 years ago
omarormachea "Ifyou want to measure the spectra of various light bulbs, you can visit this web page: Yo..." | Read more » almost 3 years ago