New, never used. Open box, no retail packaging. There is minor exterior wear from storage, including light scratches and scuffs. Older stock, this unit is marked as Best Before 12/2023. As such, it will not be suitable for certain environments. Technical Specifications Calibration Gas CylinderGas Mixture 25 ppmNitrogen DioxideCylinder Diameter 3.5 inCylinder Height 14.25 inCAS Number 10102-44-0Standards ADR CompliantCylinder Capacity 58 L MSRP: $576.08