Extech 461920 Mini Laser Photo Tachometer Counter


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Extech 461920 Mini Laser Photo Tachometer Counter The Laser Light Source is used for greater accuracy and longer measuring distances taking non-contact RPM measurements. 



  • Counter function counts up to 99,999 revolutions
  • Make non-contact RPM measurements of rotating objects
  • Use reflective tape on object to be measured and point the integral laser
  • Memory button holds last reading and recalls min/max readings
  • Easy to read large 5 digit LCD display
  • Rugged double molded housing for better grip
  • Complete with 9V battery and reflective tape
  • NIST Certified
  • Maximum distance 0.5m / 1.6ft
Extech 461920 Tachometer Mini Laser Photo  Counter.

Mini Laser Photo Tachometer Counter
Make non-contact RPM measurements (2 to 99,999 rpm) of rotating objects by pointing the integral laser (1.6-foot target distance) at the reflective tape placed on the object to be measured.

Features Overview
Measurements are displayed on the easy-to-read large five-digit LCD screen. The memory button holds last reading and recalls min/max readings display. Counter function counts to 99,999 revolutions. Rugged double molded housing for better grip. Complete with 9-volt battery, reflective tape, and user manual.

Tachometer Applications:
Motor speed, moving fans, pumps, and gears, propeller devices, and many other general maintenance, production, and automotive uses.

What is a Tachometer?
A tachometer is a device that measures the angular speed of a rotating shaft in terms of revolutions per minute (RPM). Also, a tachometer can measure linear speed in terms of feet per minute (feet/minute) or meters per minute.

How do Contact Tachometers Operate?
The sensor tip is placed in direct contact with the rotating object. After 2 seconds an accurate reading is displayed. Linear surface speed can also be measured by placing the edge of the wheel on the moving object.

How do Photo (Non-contact) Tachometers Operate?
First, a small piece of reflective tape (approximately 1/4-inch) is mounted on the object to be measured. Second, the light beam or laser is pointed at the revolving tape. The reflection from the tape provides a reading to be displayed and updated once per second. For the most accurate measurements, the distance between the tachometer and the reflective tape should be within 6 inches for a light beam and up to 6.5 feet for a laser. Fluorescent or bright ambient lights may interfere with the measurement.

Which Extech Tachometer Model Is the One for You?
A non-contact (photo) tachometer was designed for applications where it is not feasible to have the tachometer come in contact with the rotating device. This is the case in high-speed applications and/or where the object to be measured is not easily reached. A contact tachometer is also available for applications where direct contact of the tachometer with the object is preferred. You can also select a combination (contact/non-contact) tachometer for the maximum in flexibility.

Accessory: Reflective Tape for Photo Tachometers
For use with any brand Photo Tachometer. Place a piece of reflective tape on the object to be measured and point the tachometer's integral light beam at it. Ten reflective tape strips. Each strip measures 23 x 0.25 inches (584 x 6 mm).

Click here for product datasheet

Reliability / Preventative Maint / Rotational/Tachometers Template

Detection Type Non-Contact Laser
Display (Tachometer) LCD
Style of Tachometer Handheld
Max Working Distance for Non-Contact 1.6 Ft
Max RPM 99999 RPM
Measurement Modes Last, Maximum, Minimum
Accuracy for Tachmometers ±0.05%
Memory(Tachometers) Yes


RPM range 2 to 99,999rpm
Count range 1 to 99,999rev (revolution)
Max Target Distance 1.6ft (500mm)
Basic Accuracy ±0.05%
Resolution 0.1rpm, 1rev
Memory Min/Max/Last
Dimensions 6.2x2.3x1.6" (160x60x42mm)
Weight 5.3oz (151g)
Product Images (click to enlarge)
  • Extech 461920 Mini Laser Photo Tachometer Counter