It can for instance be used for as a (rental device?) for Australian scientist to test the accuracy of Polar OH1 and write a paper about it in PLOS ONE: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288 A paper which helped Peter Gamma from www.petergamma.org that optical heart rate monitors such as the Polar OH1 are not very suitable for meditation …