• Make contact measurements of rotating objects
• Measure linear surface speeds in ft/min or m/min using the three accessory wheels provided
• 0.05% accuracy
• Recalls Last/Max/Min values

The 461891-NIST is a contact Tachometer. Surface wheels measure contact surface speeds (10 to 9,999 rpm) of rotating objects. The memory button holds last reading and recalls min/max readings display. Complete with wheels for linear surface speed (0.2 to 6560 feet/minute; 0.05 to 1999.9 meters/minute) or RPM measurements. Comes with cone tip, flat tip and spare wheel for surface speed measurements, four AA batteries, carrying case, and user manual. Includes certificate traceable to NIST.