Performance characteristics: 1. this instrument is suitable for testing the foam characteristics of lubricating oil (foam tendency and foam stability). 2. the instrument USES advanced PID self-tuning temperature control system, the control performance is stable and reliable, the instrument automatically realizes fixed-point temperature control, digital display, high temperature control accuracy. 3. table split type structure, independent bath in 24 ℃ and 93.5 ℃ bath place, independent control of each other's interference. 4. equipped with input refrigeration device, ensure that at room temperature for more than 24 ℃, to 24 ℃ shower bath temperature constant. 5.both bath bodies are equipped with stirring motor, stainless steel stirring blade, stainless steel measuring cylinder bracket. 6.the instrument is equipped with timing device, accurate timing in the experiment. 7.equipped with air pump without oil and air purifying filter to provide stable pressure, clean and dry air source for the experiment. 8.the flow of all four air routes can be independently controlled. Technical indicators: working power supply: AC220V 10% standard 10A plug of 50Hz heating power: 24 ℃ bath 1 kw; 93.5 ℃ bath 2 kw cooling power: 380W temperature control range: at room temperature to 200 ℃ temperature control precision: plus or minus 0.1 ℃ controllable range of gas flow: 0ml/min ~ 160ml/min; Dividing 4 ml/min