hyjmetr
The term "hyjmetr" does not correspond to any recognized scientific instrument, device, or established concept in physics, engineering, or any other academic field. It is possible that "hyjmetr" is a misspelling of a known term, a neologism, a fictional creation, or a term specific to a very niche or obscure context that is not widely documented.
If "hyjmetr" is intended to refer to a measurement device, it is possible it is a portmanteau