610-0051-000 RAE Calibration Gas Mixture Equivalent by GASCO 10 ppm Hydrogen Sulfide, Balance Nitrogen, in a 58 Liter Aluminum Cylinder 10 ppm Hydrogen Sulfide, Balance Nitrogen, contained in a 58 Liter Disposable Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA