Only a few contact angle goniometers provide the back-to-front tilt of the camera (Fig. 1 a). Jikan CAG series are some of those handful devices that enable the user to adjust the camera view angle easily, resulting in the user being capable of seeing the contact point (Fig. 1 b) perfectly. It also provides more accurate measurements by helping the software, Jikan Assistant, to pick the contact points automatically and hence, avoiding operator error.
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)