Looking for an Optical RPM module

[Kerrowman]

I have built a device that has a spinning rotor that I would like to display its rpm. I have been using a handheld laser device that bounces off a reflective strip on the rotor (see pic).

I’m looking for a permanent module attached to the base plate with a small display unit I can mount and with any electronics put on the PCB I’m preparing.
Magnetic options are complicated as the rotor has 5 Neo magnets in it so an optical method is preferred.
 
Any ideas?
 
Thanks
 

 

[HarryA1]

You can roll your own laser  tachometer  and mount it however you wish:

https://www.youtube.com/watch?v=0UqHNrqmTRU

 

[Kerrowman]

Thanks. A useful idea but wouldn’t need to house in a case. More a question of how to place all the parts on and around my circuit.