A device (1) for a water-tightness test of a vehicle may e.g. comprising: a terahertz wave oscillation unit (20) for oscillating a terahertz wave and radiating the terahertz wave (T) to a specific test part (A) of the vehicle, a terahertz wave detection unit (30) arranged to generate a terahertz wave (T ) which is reflected by the test part (A) and a control unit (40) arranged to determine whether water has entered the test part (A) by comparing a current power of a terahertz wave (T) , which is detected by the Terrahertzwelle detection unit (30), with a predetermined reference power.
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