Only few contact angle goniometers provide the back to front tilt of the camera (Fig. 1 a). This feature enables the user to perfectly see the contact point (Fig. 1 b). It also enables the software (Jikan Assistant) to automatically pick the contact points.
Fig. 1 Back to front tilt of the camera and contact points.
Note: the back to front tilt angle does not create any error in measuring the contact angle (Fig. 2)
Fig. 2 The 5o Back to front tilt of the camera does not create error (Chini et al. (2013), Colloids and Surfaces A: Physicochem. Eng. Aspects)