Well Kier Simmon made an actual Dragon Ball Z Scouter. I mean it doesn't actually register the power level of a person so I have to wonder how practical it is, but it is rather cool to look at.
“I had to collect Scouter language graphics, vector them out, make up a few, turn them into a font, create an animation in fireworks, then bang my head against a wall until it works.”
https://www.youtube.com/watch?v=04U-Ae4uN5E
https://www.youtube.com/watch?v=3Nul5bfAblA