Clear Glass Solar Radiometer - Measures Radiant Flux of Electromagnetic Radiation

Clear Glass Solar Radiometer - Measures Radiant Flux of Electromagnetic Radiation

Crookes radiometer - a curiously retro scientific instrument for measuring light

A sealed glass case with 4 vanes that magically spin when a light source is present

No batteries required - runs on pure science (or magic!)

Kit out your office in Dumbledore or Steampunk style

Hand blown glass replica scientific instrument

Measures 15cm /6" tall