For best results, use only Industrial Scientific calibration equipment for regular instrument calibration and maintenance. All Industrial Scientific calibration cylinders are manufactured to the highest quality standards and include NIST traceable blend techniques, analytical leak testing of every cylinder, certified component concentrations and clearly marked lot numbers and expiration dates.

Industrial Scientific Calibration Gas, Mixture Reactive, Ammonia Composition, 25 ppm Concentration, 650 l Cylinder Capacity, 6.9 in Diameter X 19.9 in Height Cylinder, 24 Months Shelf Life