1. Secondary standards are calibrated with reference to a primary standard.2. The secondary standards are concerned with protecting the environment. 3. The Safe Drinking Water Act sets primary and secondary standards for drinking water. 4. Secondary standards include crystal oscillators and rubidium standards.5. These recommendations are called National Secondary Drinking Water Regulations ( NSDWRs ), or secondary standards . 6. The next quality standard in the hierarchy is known as a " secondary standard ". 7. Secondary standards are designed to protect public welfare from any known or anticipated adverse effects of a pollutant.8. Numerous algorithms have been developed to compare a Josephson standard with a secondary standard or another Josephson standard. 9. Sometimes they are ( incorrectly ) called " secondary standards " because of their high quality and reference suitability. 10. This e . g .'measuring stick'then becomes a'secondary standard ', traceable to NIST.
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