Moving this out here as its not really on topic for the OP.
First you have to NOT KNOW what the pendulum is indicating. You will get the readings, nad only afterwards find out what the analysis is, This is what makes it “blind”.
- To start just cut out a bunch of pictures that are as interesting and different from each other in color, shapes, textures as you can find, from say a magazine, or several magazines.
- Associate each picture with an answer. Yes or no is ok.
- Put them in envelopes, one to an envelope
- Mix them up so you have no idea which envelope has which answer
- Select an envelope to use with your pendulum. Ask “does this envelope contain the correct answer?”
- Continue until you have a reading yes/no for every envelope
- Open all the envelopes and record the result
- Do not stop. Repeats steps (3) through (7) two more times. Or five more times or 9 more times depending on your patient. Do it more if you are more emotional about the subject.
- At the end take an average of the results.
If your results are completely random, you are not able to use a pendulum at all, it’s not reliable and cannot be trusted, you need to practice with it more or find another divination method that isn’t enabling you to lie to yourself.