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Never heard of it.
From Wikipedia:
The focus of this journal is undergraduate and graduate level physics. The intended audience is college and university physics teachers and students. Coverage includes current research in physics, instructional laboratory equipment, laboratory demonstrations, teaching methodologies, lists of resources, and book reviews. In addition, historical, philosophical and cultural aspects of physics are also covered.[3] According to the 2021 Journal Citation Reports from Clarivate, this journal has a 2020 impact factor of 1.022.[6]
So, it's not really a typical journal in the sense of publishing original research. I checked my email records, they never asked me to referee for them. 1.022 is not really a high impact factor in physics.
But from a quick glance, it seems to be a legit journal. It's just not the typical journal.
Seems to be the perfect journal for this paper by Mr Martin... I do like this kind of paper off the beaten track.