The affordable CM130 Sound Pressure Level (SPL) meter from Galaxy Audio will allow you to quickly check dB levels.

Main Features:
• Microphone: 1/2" Electret condenser microphone
• Accuracy: ±2 dB ( under reference conditions 94dB @1KHz )
• Level Range: 1 = 40 ~ 70 dB 2 = 60 ~ 90 dB 3 = 80 ~ 110 dB 4 = 100 ~ 130 dB
• Frequency Weighting: A , C
• Time Weighting: Fast , Slow
• Dynamic Range: 30 dB
• Frequency Range: 125 Hz to 8 KHz
• Dimensions: 9.1"x2.1"x1.3"
• Battery Life: 9V Battery 110 hours (included)
• Weight: Approx. 0.37lbs. (170g)(including battery)

Also see the more advanced CM140 and CM150 models.