PURPOSE: To measure more accurately and simply turbidity varying with temp. by inserting a temp. sensor into a measuring part during turbidity measurement by scattering photometer, and displaying digitally the temp. simultaneously with the turbidity.

CONSTITUTION: A cell 1 for turbidity measurement using scattering photometer is provided to an inspecting body introducing tube 5 in which a liquid containing a colloidal organic material is fed, and the temp. sensor 2 is provided in the vicinity of the cell 1. The measured signals from the cell 1 and the sensor 2 are digitized and displayed on a digital displaying part 4. The inspecting body after the measurement is discharged from a joint part 7 by pump, etc.