1.Lubricating Oil High Temperature Foam Characteristic Tester uses stainless steel inner tank, which is safe and reliable. 2. Lubricating Oil High Temperature Foam Characteristic Tester has a built-in air pump that can supply air to two groups of samples at the same time. 3.Lubricating Oil High Temperature Foam Characteristic Tester uses a large-size true color LCD touch screen for human-computer interaction.