Contact Angle Goniometer from Rame-Hart, Inc.

The ‘Contact Angle Tool’ characterizes the behavior of a liquid on a solid. When a liquid is placed in contact with a solid surface, the bare surface of the solid absorbs the vapor of the liquid until the volatility of the absorbed material is equal to that of the liquid. When equilibrium is established, there is a liquid-solid interface between the two phases. The tangent angle between solid and liquid is known as the contact angle.

When the instrument is shipped, the system is fully calibrated. However, if the lens assembly is readjusted to any degree, the system is no longer calibrated. The Calibration Tool uses a ball bearing with a precise diameter to calibrate the magnification of the camera, resulting in 100% accurate readings. The calibration can then be verified using the Pendant Drop Tool.