Product details

  • Speed of Light Meter
  • Speed of Light Meter
Speed of Light Meter Speed of Light Meter

Speed of Light Meter

Item no.: 11226-99

  • Description
  • Scope of Supply
  • Related Experiments
  • Downloads and Documents

Function and Applications

With the Speed of Light Meter you can measure the velocity of light in air and in other transparent media and additionally you can determine the distance.


  • Measuring the speed of light, as well as distances, with only one device all thanks to state-of-the-art digital measuring technology
  • The unit is convincing by a quick set-up and a need of minimum adjustment
  • The speed of light can be measured with an accuracy in air of +/- 2%
  • Measurements can be performed with or without an oscilloscope
  • Due to the integrated display of all of the relevant measurement quantities (ƒ, Δφ, Δt, Δx) the unit is of special interest for student and teacher experiments
  • Distance measurements can be performed with the same device

Technical data and features

  • Modulation frequency: 50.0 MHz (quartz stabilised)
  • Protective class: Laser Class 2 acc. to DIN EN 60825-1
  • Digital display: 3-digit LED-Display
  • Digit height: 20 mm
  • Operating voltage: 12 V DC
  • Power consumption: 5 W
  • Housing dimensions: 206 mm x 130 mm x 160 mm
  • Weight: approx. 2 kg

Included accessories

  • 12151-99 Power supply 12 V DC/ 2.25 A
  • 11226-01 Retro-reflector with rod (1)
  • 09822-00 Slide mount for optical bench

Recommended accessories

  • 11226-02 Optical bench l = 1800 mm for speed of light measurements
  • 11226-03 Holder for speed of light meter
  • 09822-00 Slide mount for optical bench (2)
  • 11226-04 Acrylic glass cylinder with holder
  • 11226-05 Tubular cell with holder
Experiment Item no.
Speed of Light Meter Set 11226-88

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