In this article, we describe some possible areas of application of a newly developed device (FAS-2) that measures light-induced delayed fluorescence and present its performance parameters. To demonstrate its application to food, measurements were carried out on wheat grains and on egg yolk from different organic and non-organic origins, as well as on kefir which was produced using different cultures and types of milk. The performance of the newly developed device FAS-2 was comparable to that of its predecessor, FAS-1, and it showed improved precision in differentiating the origin of egg yolk. The advantages of the newly introduced measuring mode of the FAS-2, which measures the emission with spectral resolution (EmSpec-mode), were explored by using kefir. It was shown that the freshness of kefir could be detected independently of other characteristics of the milk, such as the type of milk. We would like to point out that this method is also applicable in areas such as biology or the food sector and can be used, for example, in the assessment of food quality and authenticity.