Rpm sensor

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hi looking see if possible find way use , rpm sensor small , portable output dc voltage or current directly proportional actual rpm measures dont need tacho measurement device thin king of using hall sensor dont know if there products suit? or advice etc appreciated

for hall sensor work magnet need attached spinning device. if want that'll make analog voltage measure, car tachometer taken apart might work when add voltage divider if needed. sensor phototransistor , laser pointer aimed @ spot on shaft shiny , dark sections. @ shiny spot, laser beam hits shiny shaft , reflected light turns on phototransistor. shaft encoder works same way led instead of laser.


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