[quote=@Double]
From Dragon Ball wiki:

<Snipped quote>

So yeah, Scouters are actually super useful for other things besides power level scanning. I'd be willing to bet they can perform other types of scans as well (like thermal or radiation) and are probably capable of some form of night vision functionality as well. That's on top of the actual canonical functions seen within the show that the above from the wiki describes.
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I mean, Yaksha could try to materialize one, but he would probably screw up due to being so high tech and unused to have around. Think the Supreme Kai does love tinkering so...