Decibel Meter, Digital Sound Level Meter AP-882A Sound Monitor Tester Range from 30-130dB, Digital Decibel Meter with LCD Backlight/Max Hold/Sensitivity Adjustment and dBA/C Switch (Battery Included): Amazon.com: Industrial & Scientific
Handheld Sonometer SPL Meter PCE 428 3D Model $39 - .3ds .blend .c4d .fbx .max .ma .lxo .obj - Free3D
SPL Measurements, very simple - New Plug-Ins - Audacity Forum