WATER QUALITY INSPECTION DEVICE

An embodiment of the present disclosure provides a water examination device including: a main body; a fluid accommodation unit formed in the main body; a wave source for irradiating waves toward the fluid accommodation unit; a detector for detecting a laser speckle in time series, the laser speckle being generated due to multiple scattering of the waves in the fluid; a controller for estimating existence of foreign material in the fluid in real-time by using the detected laser speckle, wherein an imaginary first plane passing through the wave source is parallel to an imaginary second plane passing through the detector.