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A-37C
Ammonia standard, concentration of 1.0 ppm as N, nitrogen
Standards are traceable to 99.5% pure reference material
A-37F
Ammonia standard, concentration of 5.0 ppm as N, nitrogen
Traceable to 99.99% ammonium chloride
A-37G
Ammonia standard, concentration of 2.0 ppm as N, nitrogen
Standards are traceable to 99.5% pure reference material
A-37J
Ammonia standard, concentration of 0.2 ppm as N, nitrogen
Standards are traceable to 99.5% pure reference material
A-37M
Ammonia standard, concentration of 3.0 ppm as N, nitrogen
Standards are traceable to 99.5% pure reference material