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a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return

a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return

a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return

a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return

a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return