• 461893-NIST
  • Usually ships in 3-5 business days



  • Large 5 digit LCD display is easy to read
  • Built-in memory recalls last MAX/MIN value stored
  • Autoranging with 0.05% accuracy
  • Non-contact measurements from 5 to 99,999rpm
  • Accurate readings updated every second
  • 2 to 6 inches (50 to 150mm) measurement distance (depending on ambient light)
  • NIST Calibration Certificate


The Extech 461893-NIST Non-Contact Photo Tachometer make non-contact RPM measurements of rotating objects using a reflective tape that is placed on the object being measured. Visible light is then directed at the tape, reflected back to the tachometer and a reading is made.

The photo tachometer with integral light beam can measure up to 6" (152mm) away from its target, has a basic accuracy of ±0.05% of reading and ranges from 5 to 99,999 rpm. For this Extech Non-Contact Photo Tachometer, the readings are updated every second and you can recall the LAST/MAX/MIN values.

The Extech 461893-NIST comes complete with 23" (0.6m) reflective tape, four 1.5V AA batteries and convenient carrying case.