Мультиметр измеряет обороты / The multimeter measures revolutions

A simple tachometer attachment for a multimeter for measuring shaft rotation speed. A stepper motor from an old disk drive is used as a rotation sensor. The motor needs to be modified in a similar way to the stepper motor shown in the video on my channel:    • Шаговый двигатель от дисковода / Stepper m...  . Other interesting DIY projects can be found here:    / sergeydorosh   Due to the prohibition of channel monetization and the disabling of ads, you can get the files for this video for a nominal fee of 100 rubles to your Sberbank card. If you cannot pay in rubles, there are other options; please mention this in your request. You can send a request for the files to: [email protected] An adjustable power supply was also used in this video:    • Карманный блок питания 4...30 В / Pocket p...  . You can see another multimeter attachment here:    • Мультиметр измеряет индуктивность / Multim...  . I used a homemade 3D printer to make the tachometer housing:    • 3Д принтер  . Subscribe to my channel:    / @sergeydorosh   , there's much more to come!