This standard specifies the classification and labeling, composition, use conditions and materials, requirements, test methods, inspection rules, marking, packaging, transportation and storage of concrete direct-reading pneumatic air content meters (hereinafter referred to as air content meters). This standard applies to the design, production and quality inspection of gas content meters.
JG/T 246-2009 Referenced Document
GB/T 1227 Accurate pressure gauge*, 2017-12-29 Update
JG/T 246-2009 history
2009JG/T 246-2009 Apparatus to determine air content of fresh concrete