Decibel

I have tried ALL the decibel meter apps, usually I compare one to the other re: the levels, unfortunately no two have ever read the same. How is one to know which is more accurate? I suppose buying a real decibel meter and comparing to that.
I like the display, the lock in of highest and lowest levels, the graph is easy to read and helps if youre in a dark environment ( I manage rock bands), often the lighting is dim. This is my favorite so far, just not sure of the accuracy though.

karokgs;lgkeprokgpsorek about Decibel Meter