This instrument adopts a Wen bridge sine wave oscillator composed of high-precision and high-speed operational amplifiers, which has the characteristics of low distortion and easy debugging. Under non-equilibrium conditions, measuring the interfacial tension of various liquid gas and liquid-liquid phases is easy to operate, stable and reliable, and automatically calculates the tension value. It can be used for determining the interfacial tension of products such as petroleum, chemical, power, pharmaceutical liquids, etc. The instrument adopts a newly improved magnetic can enclosed electromagnetic force balance sensor, which improves the response speed and linearity; The new sensor only needs to be calibrated at one point, solving the problem of the previous generation of sensors requiring multi-point calibration to ensure linearity and accuracy. The internal microprocessor of the instrument can also perform bidirectional compensation based on the working temperature, with a reference of 25 ℃, and the compensation range can meet the environmental temperature of all laboratories