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Gasco 103L-248-990 Calibration Gas (Isobutylene, 103L) - 990 PPM, 1 Each family_ProShield The ESS 740-0504 Crossbow 2XGasco 103L 248 990 Calibration Gas (Isobutylene, 103L) 990 PPM, 1 Each The Gasco 103L 248 990 Calibration Gas (Isobutylene, 103L) 990 PPM, is a precision calibration gas used to calibrate sensors in gas detection equipment for environmental emissions monitoring, industrial hygiene monitors, and trace impurity analyzers. Additionally, it is fully compatible with all manufacturers' calibration sensors, equipment, and detectors. Exceeds or meets the