There is no better way to learn electronics and robotics than building and experimenting on your robots. The RobotGeek Snapper Robotic Arm is a STEM kit with a controller based on Arduino that can be enhanced with various sensors and components.
The robot arm comes with a simple control panel. You can also program it or attach it to your PC. Snapper is powerful enough to pick up 50 gram objects. It has 8 digital I/O, 6 analog I/Os and other ports for you to upgrade your robot.