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Using the FACE method, we determined the combinatory effects of mouse chitotriosidase (Chit1) and acidic mammalian chitinase (AMCase) in natural chitin substrates processing.•FACE is a simple and quantitative method.•Our improved procedure enables the quantification of chitooligosaccharides produced by chitinases at pH 2.0-8.0.•FACE is able to quantify chitooligosaccharides at up to 10 nmol amounts. © 2020 The Author(s). Published by Elsevier B.V.We introduce an alternative method that is simple and can be used to test scale invariance or self-similarity in