Developed for the Samsung Galaxy S4 and Samsung Galaxy Note 3, full compatibility is not guaranteed on other models. Models like Galaxy S3-S5 or Galaxy Note2-Note4 are missing temperature and humidity sensor, not my fault, sorry, the device manufacturer has decided to remove these sensors. If a sensor is set as "NOT PRESENT" is because your phone doesn't have it.
The security report shows that Galaxy Sensors is safe. Alessandro Digilio is the creator of this application which is listed among the Tools category. The average score for the app is 4.4 on Google Play.