I can direct you to a site that has 16000 first hand accounts of the paranormal. There are probably thousands of audio recordings of voices in haunted buildings. There are photos and videos and investigations by the thousands that prove their existence. You'd have to be an ignorant denialist to claim there's no evidence for the paranormal.
And once more, I direct you to the fact that human perception is incredibly adept at picking out patterns, putting two and two together and getting fish - a proven psychological fact.
EMF meters that spike in unpowered locations. Thermal cameras that pick up cold spots. Infrared cameras that can see in the dark. Full spectrum cameras that film ultraviolet ranges of light. Audio analyzers that examine the voices recorded on digital recorders. Motion detectors that alarm when set off by changes in a laser beam. Vibration detectors that sense vibrations on the floor. Need I go on?
EMF Meters:
http://www.livescience.com/4261-shady-science-ghost-hunting.html
I asked Cook what, exactly, the scientific rationale was behind the equipment he sold.
"At a haunted location," Cook said, "strong, erratic fluctuating EMFs are commonly found. It seems these energy fields have some definite connection to the presence of ghosts. The exact nature of that connection is still a mystery. However, the anomalous fields are easy to find. Whenever you locate one, a ghost might be present.... any erratic EMF fluctuations you may detect may indicate ghostly activity."
In the final analysis, Cook admitted, "there exists no device that can conclusively detect ghosts."
So, right off the bat, we have a peddler of "ghost hunting" equipment ADMITTING that none of it can conclusively detect a ghost... charming.
Plus:
https://skeptoid.com/episodes/4081
EMF meters are perhaps the favorite tools. EMF meters detect electromagnetic fields, and are used in ghost hunting on the premise that ghosts emit electromagnetism, though this claim is rarely supported by any suggestion of what the power source might be. There are many different types of EMF meters. More affordable units, such as those typically used by television performers, need to be held precisely for a period of time at each of the three axis to get a reading, and so they are clearly not used on television in a manner that would produce any useful result. When they are, or when a more expensive three-axis meter is used, they are designed to detect the operation of electrical appliances or wiring. Ghost hunters are usually thoroughly accessorized with every electronic gizmo under the sun: radios, cell phones, flashlights, cameras, TV cameras, and other ghost hunting accessories; and all of these will produce a result on the EMF meter. Building wiring or appliances will also be detected. But, even in an environment with no electrical devices at all, the presence of the TV camera alone renders the EMF readings totally useless. Even without ghost hunting equipment, electrical wiring, or a TV camera, a sensitive meter can even detect the oscillation of a steel filing cabinet vibrated imperceptibly by footsteps. In the midst of all the absurd amounts of EMF pollution on a TV ghost hunting set, the pretense that the alleged EMF field of a ghost (who's not carrying any batteries) can be identified, is foolish.
So... simply put, just by having other electrical items in proximity, those EMF meters are, in essence, worthless. Plus, what on a ghost would be electromagnetic?
Infrared Thermometers:
https://skeptoid.com/episodes/4081
Infrared thermometers are the most blatantly misused of the ghost hunting tools, so are a great place to start. These handheld devices measure the temperature of the object they are pointed at. They work exactly like your vision, except that they are sensitive to far infrared instead of the visible spectrum. They measure surface temperatures, just like your vision measures surface colors. If you can see something, an IR thermometer can measure its temperature. However, ghost hunters use these devices to detect what they believe are cold spots in rooms. IR thermometers are not capable of detecting something without a visible surface. In fact, an IR thermometer is even less likely than your vision to see a hazy apparition. Firefighters use infrared because the longer wavelengths of infrared penetrate smoke more effectively than the shorter wavelength of visible light; so if there were a hazy invisible apparition floating in the middle of the room, infrared is perhaps the worst technology to detect it. Variations of IR readings inside a room are merely showing temperature gradations on the walls, caused by heating and AC, insulation variances, studs, wiring, or pipes behind the wall, radiant heat, recent proximity of another ghost hunter, sunlight, temperatures in adjacent rooms, or countless other causes.
So... the claim that an infrared thermometer can detect a ghost is absurd... it needs a physical thing to get a reading from; a smokey substance in the air simply won't do it!
Various Cameras:
Cameras of different types are used by ghost hunters. Sometimes they'll take a conventional visible spectrum camera and snap away, in the hope that spirit orbs or other manifestations will appear on the processed film. Since this phenomenon has already been thoroughly discussed in our episode on orbs, there's no need to repeat it here. Suffice it to say that all such images are well established artifacts of photography and of cameras, and well understood by knowledgeable photographers. They happen every day in photographs that have nothing to do with ghosts. Near infrared photography is the monochromatic "night shot" video that you see all the time, and that your home video camera probably offers. The light source is an infrared bulb on the camera, similar to the invisible light source inside your TV remote. These cameras record only what near infrared light is reflected from the subject, and of course they also record other near infrared sources, which are relatively common. Far infrared photography is the thermal imaging discussed previously. It's simply a visual display of the same heat sources detected by IR thermometers and motion detectors.
Now, given that everything from TV remotes to night-vision security cameras emit infrared spectrum... plus, again, what on a ghost would be emitting infrared?
As far as audio recordings:
Audio recording gear is used when the ghost hunter hopes that EVP. or electronic voice phenomena, will appear on the recording. EVP's are discussed often enough to warrant their own Skeptoid episode, and we'll be discussing them in detail in the future. An EVP is said to be the voice of a ghost, and the claim is that ghosts can talk perfectly well but can only be heard on an electronic recording. This means that recording gear has the ability to convert inaudible frequencies into audible ones. Engineers do not design this capability into most recording gear, since a change of frequency of perhaps tens of thousands of hertz would render all recordings completely useless and horrible to listen to. So, like they tend to do with all the electronic gear they carry, ghost hunters completely misunderstand, misuse, and mischaracterize the functions of these instruments.
How, exactly, would this audio equipment pick up an inaudible ghost noise when it is designed to work on the same principles as our ears?