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  1. Photometer - Wikipedia

  2. Photometry: Definition, Photometric Quantities, and Applications

  3. Photometers Selection Guide: Types, Features, Applications

  4. Photometer | Light Measurement, Lux & Lumens | Britannica

  5. Photometer - an overview | ScienceDirect Topics

  6. Photometry: The Answer to How Light Is Perceived - Photonics

  7. Spectrophotometer: Principle, Parts, Types, and Uses

  8. Photometry: What is it and How is it Used – Gamma Scientific

  9. Photometer - Definition and References - AZoOptics.com

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