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OBA-317 series 1g—100g ASTM Class 1 Calibration Mass Sets are highly-polished stainless steel, and recommended for analytical balances requiring first-order accuracy. ASTM Class 1 Precision Mass Sets come with weights supplied in 5-2-2-1 series as ASTM E617 specifies, and a protective case.
All masses or sets are available with optional NIST Traceable or NVLAP Certificates. Traceable Certificates document traceability to NIST and compliance with ASTM or OIML specifications. Add “T” to model number to specify a Traceable Certificate.
NVLAP Weight Calibration Certificates provide certification to ISO, FDA, ANSI or other requirements. Report format and contents comply with NVLAP requirements. Add "W" to model number for NVLAP Certificate.
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