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ESL-20 LED Stroboscope

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The ESL-20 has been replaced by the new and improved ESL-100. Please click here to view the new model

Measuring Range: 6 - 120,000 FPM

The brightest, fully featured LED strobe in a trim, efficient design. The ESL-20 series LED stroboscope incorporates 96 separate high-powered LEDs designed to measure the speed of rotating or cycling linear motion objects without contact or reflective tape, as well as freeze motion visually.

Using a rugged aluminum housing and the latest technology, it’s compact size, NiMH rechargeable battery and lifetime LED lights make it a perfect choice for use anywhere on the factory floor. The ESL-20 is ideal for speed, motion and vibration analysis, such as rotating shafts, fans, cams, etc


  • Store up to 19 flash rates in memory for records or quick retests (Restarts at the last flash rate)
  • Power-SAVE feature automatically turns off the LEDs if no user-changes are detected on the keypad (can be disabled if desired)
  • Operates from internal NiMH Battery or via external AC-Adapter (provided)
  • Push button operation with x2 and ÷2 buttons for easy and precise adjustment along with phase shift
  • NIST-Traceable Calibration Certificate provided
  • Battery runtime of approx. 10 hours on a single charge. Supplied with an automatic charging system that prevents overcharging and damaging the battery
  • 350 Lux brightness (measured at 6000 fpm at a distance of 50 cm)
  • 2 year warranty
  • Includes an external trigger input for flash control via an external sensor or controller as well as a trigger output
  • ET-1 External Trigger Kit is optionally available includes external sensor and AC-Adapter for auto synchronization of strobe

Light Output (LUX) vs Distance

light output
at 30 cm Distance, 6000 flashes/min (FPM)


Complete Kit

Supplied in foam-fitted carrying case with LED Stroboscope, AC-Adapter/Charger, instruction manual and NIST-Traceable Calibration Certificate.

Optional ET-1 External Trigger Kit

The External Trigger immediately synchronizes the stroboscope with a rotating object. The sensor is aimed at a ferrous target mounted on the drive shaft and triggers the strobe to flash each time the target passes the sensor. ET-1 is complete with sensor, cables and AC adapter. Ferrous target not-included


Measuring Range6.0 - 120,000 fpm/rpm
Light Source96 LED Array, never needs replacement
Brightness350 Lux brightness (measured at 6000 fpm at a distance of 50 cm)
Accuracy±0.007%, ±1 LSD
Resolution±0.1 fpm/rpm (6.0 to 9999.9 fpm/rpm)
±1 fpm/rpm (10000 to 120000 fpm/rpm)
Display12mm high, 5digit LCD
PowerNiMH Rechargeable battery
Battery Life10 hours (@ 6,000 rpm when fully charged)
Charge Time6 Hours with overcharge protection
Operating Temp32° to 113° F (0 to 45° C)
Weight1.2 lb/540g
Housing MaterialAluminum
Tripod Mount1/4-20 UNC on backside
Phase Shift0-359° in 1° increments
Flashrate AdjustCOARSE: press "x2" or "÷2"
FINE: press "v" or "^"
Synchronous OutputNPN Open collector 30V, 10mA max., 100 µs pulse width
Synchronous InputLow level: 0~0.8VDC, High level: 2.5-30VDC, or use with NPN open colector output, 50 µs minimum pulse width, negative edge trigger
Warranty2 years


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Item Description Price
External Trigger Kit
AC Adapter / Charger for ESL-20
Spare / Replacement Ni-Mh Rechargeable Battery for ESL-20
Padded-vinyl & leather belt-clip holster
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.