Practice. Using a pendulm, imo, is about getting the info out of your subconscious.
To get your accuracy rate up, try this:
- Calibrate the pendulum by asking it to “show me a yes” … wait for the response, then, “show me a no”, wait for the response. They will be different.
- Get a batch of pictures, shuffle and put them face down.
- Pick a picture without looking at it, hold the pendulum over it and ask a yes/no question, like, “is there blue in this image?”
- Record the result, and whether it was right.
- After 100 of these, take the percentage accuracy. Do another 100, and your accuracy will probably have increased. From here ask more complicated questions.
Here’s a useful free list of online images you can use.