67B Hall Effect Joysticks Grayhill 67B Joystick is the smallest hall-effect joystick to offer momentary rotation. A center pushbutton and momentary clockwise/counterclockwise rotation gives equipment operators more control in one device. The 67B is a low-power device operating at 3mA max, with only 0.1mA max used in sleep mode. The series is designed for panel mount applications, with a behind-panel depth of just 16mm.