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The TC4050 is a miniature flushmounted hydrophone, which has a flat frraenqguee.n c y response and is omnidirec-tional over the complete lover frequency The high capacitance and sensitivity of the sensor element allow for direct connection to an oscilloscope or recording apparatus. Still, -a high input impedance or a charge amplifier is required for low frequency measurements. The small active surface area of the sensor element makes it ideal for observing eddying and cavitation. The short rise time, permits measurements of accurate pressure profile of transient shock fronts.