Have you ever wondered just how loud a noise is? During a recent review of the SoundJaw iPad accessory, I needed to see if it really increased the volume of the iPad's speaker. What did I use to measure the sound level for the review? The iPhone version of Decibel Meter Pro (US$0.99, universal), a fun -- and useful -- app to measure the max, peak, and average dB (decibel) levels associated with a sound source.
