Keep your gas monitoring equipment operating accurately and reliably with these calibration gas cylinders and regulators. Each non-refillable cylinder contains a traceable span gas certified by the National Institute of Standards and Technology (NIST). Component concentrations are certified, and lot numbers and expiration dates are clearly marked. Replacement cylinders are available in a variety of sizes and concentrations for all gases detected by Industrial Scientific instruments. Flow regulators provide the correct and appropriate flow rate for the proper calibration of any given Industrial Scientific instrument. Complete calibration kits include non-refillable cylinder of appropriate span gas, a flow regulator, and a convenient carrying case. See below for available cylinders, regulators and kits. Note: Always consult your instrument's instruction manual for the correct regulator to use for its calibration.