Review on 📈 Highly Efficient REED Instruments R7050 Compact Tachometer: Boost Performance with Precision Monitoring by Knate Scarpelli

I was looking for rotating objects and bought five tachometers. This is the most expensive thing I've bought. I like the fast reading and the backlit display. But I'm disappointed that about five percent of the readings are completely wrong. I'm sure I'm wrong because when I plot the topside RPM droop readings, some of the readings are off the smooth curve by hundreds of rpm.