Petroleum testing is the analysis during upstream, midstream, and downstream production processes of petroleum products. It is most commonly used to test petroleum product, its product components, byproducts of crude oil, fuel, natural gas, upstream oil and gas and other formats of petroleum. - Special holding device can prevent cylinder floating upward very well, press block is unnecessary. Air filter, with molecular sieve. Electronic flow meter controls flow at 200±5 ml/min (optional)