In the detection of pesticide residues, the cuvette is used to distinguish the change value of the control luminosity, while the glass cuvette has absorption in the ultraviolet region and is only used for the analysis in the visible region. So glass test tubes can be used.

The cuvette can be cleaned with 50% ether and 50% anhydrous ethanol. If it is too dirty, it can be cleaned with special lotion. But it takes about 10 minutes, and then it is washed with clean water.