It is Leq or almost similar to RMS. It is a different measure. If you have an SPL meter,
normally, it will have it. Also, the meter should be set to A weighting, not C. For simplicity
sake, however, putting your meter at ear height in the area where you monitor,
set at A weighting, whatever immediate reading of 80 to 85 dB you get (Laf) that would be it. If you can
train your ear to listen to all nuances at lower SPLs, say a voice conversation
level of 70 to 75 dBA, it will be better.