See the Product Details below for detailed information about the BW Technologies calibration gas. This calibration gas detects Nitrogen (N2 99.9%+ v/v O2 <0.1% v/v) levels in the environment. This listing is for eachSpecial shipping conditions apply to this product Brand : BW Technologies Container Type : 103 L Gas 1 : Nitrogen (N2 99.9%+ v/v O2 <0.1% v/v)