Industrial Scientific CalGas 116L(100ppm CO, 25ppm H2S, 18% O2, 25% LEL Pentane)

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; Replacement cylinders are available in a variety of sizes and concentrations for all gases detected by Industrial Scientific instruments. Show Less