Liiking for IR sensor for reading RPM with a Arduino

Automation and Control Sensors Transducers
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hey folks , If I’m in the wrong location with this post , moderators please relocate to the right place . I have a project going where i need to measure RPM with my Arduino .
Something like this one , but if theres a smaller unit that I can use I’m all for that too https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Datasheet/OPB700-701.pdf
thanks
animal

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Please review part OPB732WZ. OPB732WZ can handle a higher collector current (50 mA vs. 2.5 mA), which can help with output signal strength. However, please note that it has a lower LED forward current rating (50 mA max vs. 100 mA on the OPB700Z).

I would recommend checking the datasheet to confirm it will work for you.

Here is a list of alternatives for review, if OPB732WZ doesn’t fit your application.

Thank you,
Victoria