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Reviews (3)

05 June 2018
Great Value to measure small engine RPMs
Used on engine of 20 Hp riding lawnmower ... Just add piece of reflective tape ...1/2" just like the instructions say ... I didn't have to remove anything from the engine .. just stuck the piece of reflective tape on the side of the plastic spinning top. Clean the surface for better adhesion if necessary ... The tape did stick to the side of the spinning top. Hold the laser steady until the readings stabilize .. may take 5-10 seconds .. be patient. Make sure you have a baseline for the correct RPM range from the motor specs ...it does work ! Be careful and safe ... keep your hands away from moving parts !!

19 March 2021
Sensor threads sheared during tightening
I bought 2 of these knock sensors and one of them sheared off during tightening. Thank fully it was not in tight and I was able to back it out with a magnet. The other was tightened to the specified torque with no issues. One of the sensors was bad and I replaced that one with the one that did not shear. I still give a recommend .. I believe one of the sensors I bought may have been defective

20 September 2018
Bad quality!
Just installed black ink last week Sept.12, today Sept.19, printed pages already have several lines faded. Will request for replacement.