Barometer to capture evidence of a haunting
Get base readings, so you can compare the readings you take inside the field, to find out if there is any fluctuation.
As soon as the investigation is over, log the result obtained inside the logbook.
The range of readings may vary depending of the barometer you using when hunting for ghost so do your homework.
The unit of measurement for pressure is millibars (mb). If there's an increase/decrease of 20mb then it could be considered paranormal activity and maybe even ghost manifestation.
If pressure begins to reduce below 980mb this could imply that there is a major storm coming your way. Of course the storm is believe to bring paranormal activities due to positif ion in the air during the storm and that's why you will also need a ion counter that you will find available in www.paranormalpro.com. for all your ghost hunting needs.
If you've an Ion Counter present through the ghost hunting investigation as soon as there is often a decrease in pressure, then the Ion Counter need to read positive ions within the air.
If the pressure begins to improve through an investigation to 1005mb or above then this could imply that the low-pressure storm cell is moving away from you.