Abstract: The present invention aims to provide a refractometer that can satisfactorily observe an actual state of measurement light during a measurement with low cost. A graph 311 showing detection intensity of measurement light detected by a detector and a captured image 312 by a camera are displayed on one display screen 301 in real time. This configuration eliminates the need to separately provide a display unit for displaying the captured image 312 by the camera, thereby reducing cost. In addition, the actual state of measurement light can satisfactorily be observed during the measurement through the confirmation of the captured image 312 by the camera displayed on one display screen 301 along with the graph 311 in real time.

Abstract: The present invention aims to provide a refractometer that can satisfactorily observe an actual state of measurement light during a measurement with low cost. A graph 311 showing detection intensity of measurement light detected by a detector and a captured image 312 by a camera are displayed on one display screen 301 in real time. This configuration eliminates the need to separately provide a display unit for displaying the captured image 312 by the camera, thereby reducing cost. In addition, the actual state of measurement light can satisfactorily be observed during the measurement through the confirmation of the captured image 312 by the camera displayed on one display screen 301 along with the graph 311 in real time.