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The refractometer is used to help identify gem materials by measuring their refractive index, one of the principal properties used in determining the type of a gemstone. Due to the dependence of the refractive index on the wavelength of the light used ( i.e. dispersion ), the measurement is normally taken at the wavelength of the sodium line D ...
Consumer Reports is a United States-based non-profit organization which conducts product testing and product research to collect information to share with consumers so that they can make more informed purchase decisions in any marketplace.
Consumer Reports (CR), formerly Consumers Union (CU), is an American nonprofit consumer organization dedicated to independent product testing, investigative journalism, consumer-oriented research, public education, and consumer advocacy.
Consumer Reports was established in 1936 to advance the Consumer Movement through product testing and advocating for consumer rights. Today the organization employs 500 people to conduct experiments at its laboratories, report the results, do journalism on consumer issues, and present the consumer perspective in policy discussions.
A digital handheld refractometer is an instrument for measuring the refractive index of materials. Principle of operation Most ...
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