A Petroleum Products Vapor Pressure Tester is a device used to measure the vapor pressure of petroleum products. Vapor pressure is the pressure exerted by the vapor phase of a substance when it is in equilibrium with its liquid phase at a given temperature.Tester typically works by creating a controlled environment in which a sample of the petroleum product can evaporate, and the resulting vapor pressure is measured and recorded. Temperature range=- 40 ℃ to 300 ℃;Top opening dimensions-310 x 280 mm;Display resolution-0.001;Digital resolution-0.01 ℃ , 0.001℃ for more visit labtron.us