Water droplet contact angle measurement angle measurement contact angle measurement tool bar from left to right beginning, respectively, open the sample images, select the test method, manually switch the contact angle fitting, baseline round, oval baseline fitting determine round, to be together determine the oval, draw a straight line, the mouse to select the contact angle of the ellipse fitting line end manufacturers calculate cutting angle, zoom power, edge extraction, automatic circle fitting method, automatic ellipse fitting method, automatic contour tangent method, partial contour tangent method, wide Supreme Court, young-laplace fitting, B-spline fitting, curve tracing, clear the screen, set the droplet information and display data results. The contact angle and the surface tension of the relationship can be expressed as: COS 0 = 1+ C (A a B) wherein: the liquid surface tension of the liquid-gas interface A--; B_ solid surface tension solid-liquid interface; C- - constant; 0-- liquid contact angle and solid surface. In the case of the fixed liquid contact angle meter, A is a constant value, if this is the case, then the substrate should be the same as the surface energy. Dongguan contact angle Company | ShengDing instrument (certified) | contact angle provided by the Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng Ding Precision Instrument Co., Ltd. (www.dgshengding.com) (www.dgshengding.com) is Dongguan, Guangdong, dedicated instrumentation leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Sheng Ding instrument in leadership with the staff warmly welcome all inquiries negotiations to create ShengDing instrument a better future.