Table 2.

List of components required in addition to the smartphone. Components of the voltage-circuit are condensed (detailed information given in Supplementary File).

Component	Manufacturer	Price [Euro]
3D printed holder	not specified	10–50
External LED	Philips Lumileds Lighting Company, Amsterdam, The Netherlands	5.00
Voltage-circuit	various	16.63
Cuvette	Brand, Wertheim, Germany	0.11
Transparency filters	Rosco, CT, USA	10.97
Total costs approximately		33.00–73.00