That's not to say there is no unknown physics to be discovered - of course there is - but the term "scalar" is used all over these sites without any accurate definition. One minute they appear to be are referring the AC discoveries of Tesla, the next it's some vague connection with zero-point energy - which. incidentally, hasn't been confirmed beyond doubt yet.
If you google "scalar wave detection" it returns just magnetic field or radio-wave detectors. "Scalar wave generators" returns the same sort of stuff, including Tesla coil experiments.
BTW, Tesla was a genius, but his Tesla coil invention is only a high-voltage AC transformer. They are real and there are many amateur hobbyists who make very impressive ones -
they can be modulated with music! Very impressive but not a scalar wave in sight - well there wouldn't be would there!