How do I measure RPM from a gear tooth sensor.

Hi

I have a NPN type gear tooth Hall Effect speed sensor that produces a pulse (voltage drops to zero then back to the pull up voltage value V) with every passing gear tooth.

I want to measure the speed of that rotating gear at a rate of at least a 100 Hz (meaning a 100 readings per second for monitoring purposes).

How do I perform this measurement? What hardware would I need? I currently have the USB 6002 with 1 built in counter but no hardware clock so I can’t perforce frequency measurements with it😭.

I know the formulae for RPM from pulses is:

I can I reliably get the Pulse frequency?

Regards.