There are plenty of battery-powered motorized camera stabilizers on the market. The GravGrip takes a different approach. It is a hydraulic iPhone stabilizer that lets you shoot smoother video. It lets you mount your camera in roll and tilt position to capture all kinds of low and high angle shots.
The GravGrip comes with stainless steel counter balance weights. You can adjust the speed by rotating the weight set upward or downward. You can level the horizon in a flash. The GravGrip is expected to ship in October for as low as $35.[where to get it]