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  • cell 1. A single unit in a device for changing radiant energy to electrical energy or for controlling current flow in a circuit. 2. A single unit in a device whose resistance varies with radiant energy. 3. A single unit of a battery, primary or...
  • spectrophotometer An instrument for measuring spectral transmittance or reflectance.
  • reflectance spectrophotometer An instrument that spectrally analyzes the flux reflected from a material. The reflected flux may be total, diffuse or specular. Often the instrument measures the reflectance factor instead of the reflectance.
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