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国家计量标准(JJ)
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Measuring Instruments for Diffuse Transmission Visual Density
JJG 2028-1989
Measuring Instruments for Vickershandness
JJG 2026-1989
Verification Regulation of Capacity Measures(glass)
JJG 20-2001
Viscosity Measuring Instruments
JJG 2016-1987
Brinel Hardness
JJG 2005-1987
Verification Regulation of Instruments for Measuring the Moisture Content of Grain with Baking Method
JJG 658-1990
Verification Regulation of Flow Standard Facilities by Master Meter Method
JJG 643-2003
Verification Regulation of Differential Pressure Type Flowmeter
JJG 640-1994
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