- Details
- Category: Tachometers

The 461891 is a contact tachometer. Surface wheels measure the contact surface speeds (10 to 9,999 rpm) of rotating objects. The memory button saves the last reading and recalls the min/max readings display. Complete with wheels for measuring linear surface speed (0.2 to 6560 feet/minute; 0.05 to 1999.9 meters/minute) or RPM. The kit includes a cone tip, flat tip, and spare wheel for measuring surface speed, as well as four AA batteries, a carrying box, and a user handbook.
Rotation Speed (Contact) | 0.5 to 20,000rpm |
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Rotation Speed (Contact) Basic Accuracy | ±0.05% of reading |
Rotation Speed (Contact) Max Resolution | 0.1rpm |
Surface Speed (Contact) | 0.2 to 6560ft/min, 0.05 to 1999.9m/min |
Surface Speed (Contact) Basic Accuracy | ±0.05% of reading |
Certifications | CE |
Dimensions | 6.7 × 2.8 × 1.5" (170 × 27 × 37mm) |
Power | 4 × AA (1.5V) batteries |
Warranty | 2 years |
Weight | 9.2oz (260g) |
- Details
- Category: Tachometers

The Extech 461830 is a digital StroboTach tachometer. Freeze motion and examine rotating objects without contact. Checks and analyzes motion and speed by simply aiming and synchronizing its flash rate (FPM) with a rotating target. Ideal for determining the speed of moving gears, fans, pumps, motors, and other equipment used in general maintenance, manufacturing, quality control, or laboratories. Comes with a 6-foot power line, a handle, and may be tripod mounted.
Duty Cycle | 5 to 30 minutes |
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Rotation Speed [Photo] | 100 to 10,000 fpm/rpm |
Rotation Speed [Photo] Basic Accuracy | ±(0.05% of reading +1 digit) |
Sampling Time (Strobe) | 1 second |
Certifications | CE |
Dimensions | 8.3 × 4.8 × 4.8" (211 × 122 × 122mm) |
Warranty | 2 years |
Weight | 2.2 lbs. (1 kg) |
- Details
- Category: Tachometers

The Extech 461825 Combination Photo Tachometer and Stroboscope can be used to measure tachometer RPM, as well as analyze stroboscopic speed and motion. Depending on the measuring mode, the distinctive display reverses the character direction. The tachometer memory retains the last, maximum, and minimum readings for recall. The strobe has three ranges for adjusting the course and fine flash rates. It comes with four AA batteries, reflective tape, and a carrying box.
Rotation Speed (Strobe) | 5 to 99,999rpm |
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Rotation Speed (Strobe) Basic Accuracy | ±0.1% of reading |
Rotation Speed (Strobe) Max Resolution | 0.1rpm (<1,000rpm), 1rpm (≥1,000rpm) |
Rotation Speed [Photo] | 100 to 100,000 |
Rotation Speed [Photo] Basic Accuracy | ±0.1% of reading |
Rotation Speed [Photo] Max Resolution | 0.1fpm (<1,000fpm), 1fpm (≥1,000fpm) |
Sampling Time (Photo) | 1 sec ≥ 60rpm; |
Certifications | CE |
Dimensions | 8.5 × 2.6 × 1.5" (215 × 65 × 38mm) |
Power | 4 × AA (1.5V) batteries |
Warranty | 2 years |
Weight | 10.6oz (300g) |
- Details
- Category: Tachometers

A tachometer is a device that determines the angular speed of a rotating shaft in revolutions per minute (RPM). The Extech 461750 Tachometer has surface wheels that measure the contact surface speeds of rotating (10 to 9,999 RPM) and moving (3 to 6,560 ft/min; 1 to 1999.9 m/min) objects. Complete with a 9-volt battery and surface wheels.
Rotation Speed (Contact) | 10 to 20,000rpm |
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Rotation Speed (Contact) Basic Accuracy | ±(0.1% of reading + 2 digits) |
Rotation Speed (Contact) Max Resolution | 0.001rpm |
Sampling Rate | 1sec>60rpm, >1sec>10 to 60rpm |
Surface Speed (Contact) | 3 to 6560ft/min, 1 to 1999.9m/min, 1 to 5,000yd/min |
Surface Speed (Contact) Basic Accuracy | ±(0.1% of reading + 2 digits) |
Surface Speed (Contact) Max Resolution | 0.0001ft/min |
Certifications | CE |
Dimensions | 5.87 × 1.97 × 1.3" (149 × 50 × 33mm) |
Power | 1 × 9V battery |
Warranty | 2 years |
Weight | 5oz (142g) |