Fig. 1.

Setup for urine sample evaporation and turbidity measurements. A urine sample, B cooler, C container for distillate, D under pressure pump, E water bath, F sliding elements and holder of the waveguides, G elastic holder, H optical waveguide inserting the beam light, I laser, J optical waveguide for reading of scattered light, K PIN silicon photodiode, M data acquisition interface, N phase sensitive trigger, O sensor of the trigger, P voltage stabilizer, S USB cable, L automatic stop cable, T display