Specifications include, but are not limited to: : Six (6) Isobutylene calibration gas, 100 ppm mixture w Air balance, 116 L, Returnable/Refillable cylinder, CGA-600 male thread connection. Six (6) ea Mixed gases calibration gas, 116 L, refillable/returnable cylinder, C-10 female threaded connection. Mixed gases configuration: Hydrogen Sulfide (H2S) - 10ppm, Carbon Monoxide(CO) - 50ppm, Methane 250% - 50% LEL (2.5% volume), Oxygen - 18%, Nitrogen balance; Shipping of calibration gases. Cost may include Hazardous Materials charge. These costs must be included in the submitted quote if the cost will included at invoice. No shipping will be paid by the County if the cost is not stated on the selected vendor's quote and included on the Purchase Order. The county will not pay shipping directly to a shipping/delivery company for drop-ship.