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Blue 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