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QBS-LED Battery Powered LED Stroboscope Peak Brightness of 10,000 LUX
118 High-Powered LEDs

Made in Germany
QBS-LED Stroboscope
Click images to enlarge.
Flash range of 30 - 300,000 fpm (0.5-5000 Hz)

The Checkline QBS-LED is a hand-held, battery-powered stroboscope featuring 118 extremely bright LEDs for the highest light output in its class. Designed for machinery observation, visual inspection and motion analysis, its robust design is suitable for use in the toughest industrial environments.

The QBS-LED features a robust aluminum housing fitted with forty long-life, high-performance LEDs providing a peak brightness of 10,000 Lux and convenient adjustment of flash duration to easily select the optimal balance of brightness and image sharpness. A built-in Lithium-Ion battery provides up to seven hours of continuous use on a single charge. It is supplied with a universal battery charger (100-240VAC) with USA, Euro and UK plug adapters.

The strobe is extremely easy-to-use, as functions such as flash rate and brightness adjustments are separated from the special functions that are found a separate menu. The special functions include phase shift, internal/external trigger selection, flash delay, divider and "Slow Motion" mode.

The QBS-LED uses the "strobe effect" whereby when the flash rate is equal to the rotational speed, the target will appear "frozen". Typical applications include; motion and vibration analysis, balancing of rotating shafts, fans, cams, high-speed motion analysis of speakers or ink-jet printing and more. Ideal for use in the textile, paper making, sheet metal production, automotive and printing industries.

Built-In Laser Light Source provides a Non-Contact "Tachometer Mode" when used in combination with reflective tape. It also features a unique "Auto-Sync" feature using the Laser Tachometer Mode to automatically set the correct flash rate to instantly "freeze" the rotating target without requiring any adjustment by the end-user. It also features a "Slow Motion" Mode that allows the user to offset the flash rate to put the "frozen" image into virtual "slow-motion".

Also know as SKF TKRS 41 and A4-3550


  • Traceable Calibration Certificate provided
  • 118 High Power LEDs produce 10000 Lux Peak Brightness
  • Flash range of 30 - 300,000 fpm (0.5-5000 Hz) with user-selected units of Hz or FPM (Flashes Per Minute)
  • Selectable units of "FPM, "Hz" or "1/MIN"
  • Backlit LCD Display for optimum viewing in all lighting conditions
  • Built-In Laser Light Source provides a Non-Contact "Tachometer Mode" when used in combination with reflective tape
  • "Auto-Sync" feature uses the Laser Tach Mode to instantly "freeze" rotating target without any adjustment
  • "Slow Motion" Mode allows user to offset the flash rate to put the "frozen" image into "slow-motion" (External Trigger Mode only)
  • "PRO Mode" provides additonal functions including Multiplier, Delay and Memory (5 User-set Values)
  • Built-In Litium-Ion battery provides up to five hours of continuous operation on a single charge. Battery status is shown on LCD display
  • Adjustable flash duration allows for optimal tuning of brightness and image sharpness for every application
  • Additional features include "Phase Shift" and Internal/External Trigger
  • Threaded mounting holes for fixed mount applications
  • Rugged, lightweight aluminum housing with an ergonomic handle, convenient operator controls and backlit LCD display
  • Supplied with universal AC battery charger. Can also be used to continuously power the QBS-LED for fixed-mounted use
  • Made in Germany
  • CE Certified with 1-Year Warranty

QBS-LED Stroboscope
Auto-Sync Function

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Complete Kit

The QBS-LED is supplied as a complete kit including the strobe, removable handle, universal AC adapter with USA, EURO and UK plugs, DIN connector (for use when externally triggering from sensor), reflective tape, traceable calibration certificate and instruction manual with Quick-Start Guide -- all supplied in a foam-fitted plastic carrying case.


Number of LEDs118
Flash Rate30 - 300,000 FPM (0.5 - 5000Hz)
Accuracy± 0.02% (± 1-digit/±0.025usec)
Flash DurationAdjustable (1 usec up to 2000 usec)
Resolution± 0.1 FPM (30 - 999)
± 1 FPM (1000 - 9999)
± 10 FPM (10,000-300,000)
Brightnessapprox. 8,000 Lux @ 1° Sharpness & 300 mm (12 inch) distance
DisplayLCD, multiple lines
Flash ColorApprox. 5,000 - 8000 K
PowerBuilt-In Lithium-Ion rechargeable battery, 3100 mAh
Housing MaterialAluminum
Dimensions150 x 130 x 112 mm / 6 x 5.1 x 4.4 inch
Weight1.15 Kg (2.5 Lbs)
Temperature Range0° - 40° C / 32° - 104° F
Battery Lifeapprox. 2:30 Hours @ 4,000 Lux (0.50°)
approx. 5:00 Hours @ 2,000 Lux (0.25°)
ReCharging Time6-8 hours (for complete charge from EMPTY)
Warranty1 Year
Default SettingsFREQUENCY=1000 FPM, BRIGHT=1°/166usec, PHASE=0, TRIGGER=INT, Display Units=FPM, Miltiplier=x1, Bright Units=deg, Delay=0msec, Divider=1, Slow=0, Trigger=0(rising)
Housing ProtectionIP30
Mounting Holes1x 1/4"-20UNC (in center)
2x M5 Threaded Holes (60 mm c:c)
Trigger Input Signal3...30 V / max. 5 mA (Isolated optocoupler)
DIN 41524 5-pin standard plug
Uout = 24V DC, 60 mA
switchable trigger input
Trigger Outputnot available
CertificationCE (as per EU norms)


Buy Now

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Rechargeable Lithium-Ion Battery Pack for QB-LED & QBS-LED
Replacement Universal AC-Adapter/Charger (100-240 VAC)
In stock
1 Week Lead Time (Estimated)
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Lead Time Varies, Please contact us for availability.