The Ouija board is an option, it an be dangerous though. Also try on October 31(Halloween, samhain, ect). It's said on this night the veil is super thin.
Try pendulum's as well. Maybe do a ritual included, like candle lighting, chanting, and call only good spirits to come fourth.
An option I have heard that works is a basic pen and paper. All you do is ask a question, ask a spirit to come, and let your hand be free and still. Some people use this, and get answers. There are sometimes scribbles, or pictures, or even words! To do this, it's best to do the ritual.