3M 10116, Synthetic Steel Wool Pads, 10116NA, #2 Medium, 2 in x 4 in, 7000047708 
Insize 9223-120, NON-CONTACT TACHOMETER, 2.5~99999RPM, 6974029771736
$72.09
Resolution 0.1RPM/1RPM
Accurately measure the rotary speed without contact
Automatically save the maximum value, minimum value and the last value, 500 data can be stored during continuous measurement
With backlight display
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