But it gave similar readings for my Marauder in three configurations:
1) shroud on, but no baffles in.
2) stock with 4 baffles
3) modified with 2 extra baffles for a total of 6.
now the difference in all three was obvious to my human ear, but the meter showed about the same level for all three configurations.
I think Dave is right, you need an "impulse" meter for measuring airgun noise.
Mine just had slow and fast. I used fast, but it must be doing some sampling and averaging that washes out the true peak.
By the way, this is the same meter Paul capola uses to measure airgun noise on his videos for Pyramyd Air.
Ray