I have no idea what I would use this for but it looks cool and I want one.
I think it’s an alien probe but I can’t be sure because I was a little woozy when I last saw one.
Amazon review
Cat toy/fidget spinner radar gun
By Fat Daddy Fly Socks Soul on April 05, 2018
I use this to do stupid crap like checking the RPM of a fidget spinner and making cats run in circles. It excels at both tasks.
(this mehbe right up your alley) 
I use it for checking RPM of a jet turbine engine. It works great at 90,000 RPMs.
Now I definitely want one.
So my husband has a lathe and a milling machine, should Santa get this for him? 
That’s why I’m buying one, to test my lathe and mill speeds.
Looks like a good deal.
I want one,
I can’t/won’t install an app on my work phone or computer…
Too bad for me…
If you visit the site through a desktop I don’t see the problem using a mobile device