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STANDARD; CALIBRATION; NBS OR NIST 17 LABORATORY MATERIAL OR ACCESSORY; COMPONENT: CALIBRATION STANDARD; APPLICATION: CHEMICAL LABORATORY; SOLID FORM DIAMETER: 1 1/4", THICKNESS: 3/4" (NATIONAL BUREAU OF STANDARDS) - THE SUPPLIER MUST ANNEX ORIGINAL SIGNED CERTIFICATE AND MUST BE VALID FOR ISO-9001