Some pieces of ghost equipment are basic and require a low level of experience or just common-sense to use. There's no absolute right way to find or communicate with spirits. If they are around and want to make their presence felt, heard, sensed or seen they'll find a way to do it without any needed equipment most of the time.
However, sometimes you may need special-equipment to "capture" an apparition or to at least try to prove your point that you've just seen a ghost. I'll be adding to this list as time goes on.
Useful to tell time with, also good to log the time of your arrival and the time of departure.
OK, now batteries are the most important pieces of equipment you'll need to bring during your ghostly hunt. It's no fun getting equipment set up and ready to go just to find out your battery life is near depletion. Might as well call it a night then. Be sure if you're using battery-packs that they're fully-charged, bring a spare just in case. Bring extra batteries for cameras, flashlights, whatever else that requires AA or other types of batteries.
Cameras are a main-component and are practically an necessity when conducting a ghost-hunt. Be sure to take as many pictures as possible, you can never take too many pictures or record too long when performing your search. The difference between capturing something paranormal and not could have been because of that one area you've decided to skip over!
These cameras have been used for years and are the backbone of most ghost-hunts. Very seldom do ghost-hunters go out without one of these on hand. You will usually want to have infrared or black and white film. The price on these have dropped significantly and vary from manufacturer to manufacturer.
These cameras have come along way in the past couple of years and are an excellent-source of capturing the supernatural. As a matter of fact...I use an inexpensive 6.1 megapixel digital-camera when I perform all of my ghost-hunts. I've gotten great(spooky)results with it. This doesn't mean that you shouldn't use a higher megapixel camera, by all means go ahead... the higher the megapixel the better the clarity.
I'd try to refrain from using a really low megapixel-camera as it may just produce graininess especially during night-hunts. Digital-cameras are really convenient as the results are instantaneous and in most cases, can be directly uploaded to your computer whenever you're done. The price-ranged for a digital camera varies from very reasonable to very expensive from brand to brand.
Also highly recommended. These are a great source as well when hunting, as they may pick up things regularly unseen or invisible to the naked-eye in real-time. You'll definitely want a video camera with night-vision if you're doing nighttime ghost-hunting. Most night-vision cameras are pretty expensive, however you can get night-vision scopes or converters to attach to your camcorder at a pretty reasonable price.
Be sure that if you're using a digital video camcorder that uses cassettes be sure that they are brand new and not recorded over as this may distort quality and give false results. Again, digital-camcorders are an excellent source of capturing something out of the ordinary and are convenient, small in size and data is easily uploaded to a computer.
Motion Detection Cameras:
These are pretty nifty...they snap pictures whenever motion(movement) is detected some even begin to record video, very useful in capturing an ornery spirit, usually the ornery spirits are poltergeists.These also range in at very reasonable to pretty expensive.
Candles and Matches
Very handy when dealing with a spirit that causes electrical-interference. Really any artificial-light-source that does not require an electrical-current(Candles, lantern, glow-sticks, etc).