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User's Guide COMBINATION CONTACT/PHOTO TACHOMETER Model 461895...
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Introduction Congratulations on your purchase of the Extech Combination Contact/Photo Tachometer, Model 461895. The combination tachometer is a patented design providing contact and non-contact RPM measurements. In addition, linear surface speeds can be measured in ft/min or m/min. Careful use of this device will provide years of reliable operation.
Function Switch – Select Tachometer or Linear Surface Speed mode. Rotating shaft – In the contact mode of operation, carefully touch the shaft to the moving object. Measure button – Press to initiate a measurement. 1`Battery compartment on rear 461895-EN V2.1 8/13...
Press the Measure button while lightly pressing the rotating ring against the center opening of a rotating shaft. Release the Measure button once the display has stabilized (approx. 2 seconds). CAUTION: Rotating objects can be dangerous. Use extreme care when holding the meter near a rotating object. 461895-EN V2.1 8/13...
The low battery indication (LO) appears when the batteries need to be replaced. To replace the batteries: Open the rear battery compartment by removing the screw that secures it. Replace the four 1.5V AA batteries. Replace the battery cover. 461895-EN V2.1 8/13...
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