The app is easy to use and helpful

Im not sure why people are complaining about the lack of instructions, the app is straightforward and simple. The morse code can be helpful if you are lost. Depending on your phone and case, the protractor and sound meter results will vary. Why do people expect so much out of a phone app? If they really need a professional reading, they should buy a specialized tool. The mobile phone app gives a great approximate value.

JeWar01 about ytools-flashlight,ruler,spirit level,protractor and sound level meter