A PMMA flow-cell, along with different inlet/outlet ports for sample/reagent introducion, draining, and titrant dosing.

The optical path 10 mm.

An RGBW LED, along with a black plastic pin-holed shielding plate constitutes the emitting section, while the absorbance is measured via a TCS3200 (datasheet) selectively filtered light to frequency converter. A magnetic stirrer is driven via two spinning magnets.