Figure 6. Setup of the low-cost photometer composed of a 3D-printed cuvette holder with integreted LEDs and a voltmeter

From

Spectroscopic Studies of Food Colorings

Patrick Gräb, Ekkehard Geidel

World Journal of Chemical Education. 2019, 7(2), 136-144 doi:10.12691/wjce-7-2-13