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Yeah, You can simply use a Hall effect sensor to do so.
2 years ago I made one using a hall effect sensor I picked up from a computer Fan. I used a calculator as the counter.
Were you able to actually get a calculator internal clock circuit pulse to increment a counter ... for a given time interval? ..... Or maybe just use the Hall sensor pulse to add +1 to a calculator memory register..using a keypad trace ...for a given time period...