The integral inclined contact angle measuring instrument adopts the principle of optical imaging to measure the surface contact angle, wetting performance, surface interfacial tension, surface energy, rolling (slip angle), forward and backward angle and hysteresis of the sample through image profile analysis. . In the fields of mobile phone manufacturing, glass manufacturing, surface treatment, material research, chemical engineering, semiconductor manufacturing, coating ink, electronic circuit, textile fiber, medical biology, etc., contact angle measurement has become an important instrument for evaluating surface properties.