Features of piezo-electric accelerometer

The features of piezo-electric accelerometer are:
i. Instrument is quite small in size and has a low weight.
ii. The natural frequency is very high.
iii. Useful for high input frequencies and the response is poor at low frequencies.
iv. The crystal is a source with a high output impedance and in order to avoid loading effect, a voltage monitoring source of a high input impedance should be used.