A: Hydration fluctuations which may result from alcohol or food consumption, sleep, intense exercise, medication or pre-menstruation.
- A very full bladder.
- Severe calluses on heels or soles of feet (about 1/400 people tested).
- Unclean foot pads may interfere with conductivity.
- Nylons interfere with conductivity. If it is absolutely necessary to measure in nylons, use a drop of isopropyl (rubbing) alcohol on the foot pads to act as a conductor.