As gadgets go, the pendulum is extremely useful and has been so since even before the wheel was invented.
Legend has it that it was the inventor of the pendulum who also invented the wheel.
First through minimal awareness in focusing on both our mind that we should have intimate contact with when, as they say, we're together, and onto an object and making it move as a direct result of exercising the power of the mind. After it does it, mentally have the idea it is swinging in a circle, and when it begins in a clockwise or counterclockwise movement, have the idea that it is swinging in wider and wider circles. While the pendulum is still swinging in its wider circles direction, have the idea that its direction is reversing from clockwise to counterclockwise or visa versa. The experiment works because expectancy determines outcome. In the real deal world, by simply having a handle on penduluming longer range weather forecasting than is offered by the weather services is entirely possible.