Cutting tools and drill bits work best when run at the correct speed for the material being cut. Too fast or too slow can result in inefficient cutting, rough surfaces, heat buildup, premature dulling and/or tool breakage. But not all machines have feedback to tell you how fast they are running. The Pro Trinket Tachometer attaches to your machine to sense and display the actual rotation rate. It can be adapted to fit many common shop machines.
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