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. - Use heat resistant glass interlayer on the heater, avoid oil splash and fire breaking out. Automatic stop if there isn't operation after heating 20 minutes. Automatic air cooling when temperature is too high.