It can now out-perform the standard peak program meter (PPM) specs (for which this a good reference), and has a span of over 60 dB with easy setting of the desired minimum and maximum levels. Figure 1 ...

A peak flow meter is an inexpensive, portable, handheld device for those with asthma that is used to measure how well air moves out of your lungs. Measuring your peak flow using this meter is an ...

Check the ambient noise around you. You'll see a decibel reading as well as a colored bar meter. If it's safe and not presenting any threat to your hearing, you'll see the meter staying green.