Things that can Cause an Incorrect Response from the Pendulum:

Poor communication. (inaccurate phrasing) The most important thing is how you phrase the question. For example, don't just ask "Is this water good for me"?" Be more accurate: Good in what way? The water may have both good and bad aspects. For example, you may be extremely thirsty, so the water is good for replenishing your body fluids, but the water could be tainted and later give you diarrhea. So state the question more clearly such as "Will this water serve my highest and greatest good?"

Asking questions that are too general: Don't ask general questions such as "Is Mary healthy?" Rather ask specific questions such as "Is Mary's diet causing her health problems?"

Forcing the situation. Using the pendulum even though the time or circumstances may not be right.

Being off Center: Feeling mentally or emotionally out of balance. You need to be in the right frame of mind.

Focusing too heavily on the pendulum itself, and not enough on the information inside you.

Being too close to high frequency electrical equipment (operate at least 3 ft from a TV or computer screen).

If you start to work with the pendulum, and you are not getting clear swings on the answers, then go over what could be causing this. Ask the pendulum "Is there a more appropriate time?" (perhaps there are children screaming in the other room), or "Is there a more appropriate place?" or "Is there a more appropriate way to state the question?" These are always easy questions to get accurate answers to.

Being tired.