Pendulums are the main go to for communicating with spirits, but they aren’t a one size fits all device. For example your darker spirits might react well to obsidian but a white art spirit won’t. Having a nice variety of pendulums can come in handy, so I’m recommending this listing on Amazon! Of course if you only want one the seller also sells them individually.
This is an affiliate product on amazon, I’ll earn a commission if you buy, but I still stand behind this product and personally endorse it.