Uni 3220 [upd] | 2025 |

How to measure RPM safely, accurately, and without stopping your machines.

This compact, laser-guided tachometer allows you to measure Rotations Per Minute (RPM) from a safe distance. Whether you are an HVAC technician diagnosing a faulty blower or a hobbyist balancing a CNC spindle, here is everything you need to know about the Uni 3220. The Uni 3220 is a non-contact digital tachometer. Unlike old-school mechanical tachometers that required physical contact with a spinning shaft, this device uses a visible laser beam to measure reflective pulses. uni 3220

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. How to measure RPM safely, accurately, and without

Hold the device 50mm to 500mm (2 to 20 inches) away from the rotating object. The laser spot should hit the reflective tape squarely. The Uni 3220 is a non-contact digital tachometer