A sound level meter is used for acoustic (sound that travels through air) measurements. It is commonly a hand-held instrument with a microphone. The diaphragm of the microphone responds to changes in air pressure caused by sound waves.
Vibration Meter is an apparatus for measuring the displacement, velocity, or acceleration of a vibrating body.Vibration meters designed for easy on site vibration measuring of all rotating machinery, capable of measuring vibration risk measurement, machine monitoring or vibration analysis.The vibration is recorded with great precision. The devices are usually portable and their readings can be saved partly and retrieved for later use.