Tarot doesn't do yes or no terribly well - Tarot is for when things are complex and need insight. Yes or no isn't insight, just an answer. I keep a pendulum with me for quick and definite yes-no answers, and have it around as a supplementary tool when I'm going readings in case during the reading the client asks a yes-no question that can't be rephrased as a question for more info and insight.
It's worth noting that pendulums are very susceptible to changes in your personal energy, changes in the energy in the space around you, changes in the tides if you are near a coast, changes in geo-magnetic energy, and I believe even to the 11-year solar flare cycle (I've been using them long enough to notice that cycle as well as a greater pattern overlaying all the little ones).
They change their minds. I've never used a metal or a wooden pendulum so I can't speak for them, but over the decades I've used a rutilated quartz pendulum and a single-point clear quartz pendulum (one of them is reserved for radionics work, one for yes-no questions), and they both change from time to time. In order to allow for them changing their "minds", this is what I do.
Before I ask a question, I'll hold the pendulum and ask it to demonstrate a yes-swing (or a girl-swing). I'll watch how it starts to move. Then I'll bring it to a stop, and ask it to demonstrate a no-swing (or a boy-swing), and watch how it then starts to move. When I know what both swings are for the session, I'll thank it and move on to the question.
Even if you don't believe things change, it is only good manners to check with the pendulum.
The swingds it cane come up with for the two different answers are a forward-backward swing, a left-right swing, a clockwise round-swing, an anti-clockwise round-swing, and on a couple of occasions over the years a diagonal-one-way swing and a diagonal-the-other-way swing.
I have had yes-no being the two round swings, or one round swing and one straight one, I have had a forwards swing versus a sideways swing for the answers, and on one red-letter occasion only recently (once in my whole life), yes was an anti-clockwise swing and no was a completely still pendulum.
Always do that quick check first so you don't get fooled into giving an inaccurate answer. It helps to know what your tools are doing.
