Disclaimer: Always wear appropriate PPE when working around rotating machinery. Remove loose clothing and jewelry.
How to measure RPM safely, accurately, and without stopping your machines.
Press the red "Measure" button to turn the unit on. Ensure the LCD screen shows "LASER" on the left side. uni 3220
If you maintain industrial motors, RC cars, or even bicycle wheels, this $40-$60 tool will pay for itself the first time you diagnose a failing bearing (overheating due to high RPM) or calibrate a variable frequency drive.
Numbers keep jumping (e.g., 1500, then 3000). Fix: The sensor is seeing double reflections. Move the unit closer or cover any shiny surfaces behind the shaft with black electrical tape. Final Verdict The Uni 3220 is a workhorse. It isn't fancy, it doesn't have Bluetooth, and it won't log data to an app. But it will tell you exactly how fast something is spinning within +/- 0.05% accuracy every single time. Disclaimer: Always wear appropriate PPE when working around
Hold the device 50mm to 500mm (2 to 20 inches) away from the rotating object. The laser spot should hit the reflective tape squarely.
Mastering the Uni 3220: The Ultimate Guide to Your Contactless Tachometer Press the red "Measure" button to turn the unit on
If you work with motors, fans, conveyor belts, or any rotating machinery, you know the golden rule: That’s where the Uni 3220 becomes an indispensable tool in your toolkit.