I could be wrong but I believe the phone apps that give decibel readings use your phones microphone to calculate the noise level, which you were covering your phones microphone with your pinky finger lol. Might get a better, more consistent reading by pointing the bottom of your phone toward the unit. With that said, I just got my hr 500 today and I’m disappointed in the noise level. No noticeable difference in my opinion. Only reason I bought it is because my hr230 drives me nuts, especially in ground blinds. I compared the noise today and they’re both about the same noise level.