There are a lot of things you can do with pendulum and it is amazing. Each stone is unique and choosing what is best for you.
It is a great tool you need to consider when making big decisions. You just have to make sure that every question you ask to the pendulum is answerable by yes or no.
The things you can do with pendulums are limitless. It reacts based on your intuition that sends a signal to your fingers up to the chain of the pendulum.
Obsidian - can be use as a protection amulet and to assist you to see the larger picture of what is happening in life. It is a truth enhancing stone. Obsidian is strongly protective and it forms a shield against negativity. It blocks psychic attacks and absorbs negative energy from the environment. Obsidian is good for mental stress and tension.