Now this one is going to be the expensive one. I know you saying how that can be all I need is a digital recorder. Wrong that a start the second thing you need to pick up is a decimal reader it will let you know if the sounds is coming from the area of the recorder or not also help with debunking as well as tagging which is also a good tool don’t ever stop tagging ever. But I digress back on topic this are not the only tool you need but at least it is a start. So with tagging and a decimal reader all that tell you is everything in the imitate environment but one thing the biggest thing that most scientist try to say they are is radio waves also now as radio frequencies.
Now there is a tool to check for this is EMF-829 is used for broadband devices of monitoring the wide range radio frequency electromagnetic field Measurement V/m, mW/cm^2, W/m^2. Monitoring electromagnetic field, for example: cell-phone station, hospital equipment, radar, micro-wave oven, radiation work, TV antenna, Radio station, welding setting value. Equipment, baking- equipment, television, computer, factory, laboratory, and other environment…etc. For precision measurement consideration, the meter Accuracy ± 2 dB. There are included two probes : Probe Type EP-01H : 100 MHz to 3 GHz. EP-02L ( Low frequency Probe, 100 KHz to 100 MHz ) EP-01H ( High frequency Probe, 100 MHz to 3 GHz ) know it runs a lot more than $500 dollars. But running this with everything can rule out more and more but can only be run at the same time as all the other equipment. Know doing all that and filming it all at the same time you are documenting and proving your evp instead of forcing the proof
The next part is analyzing the sounds you have to brake the sound apart lessen to it at all levels a sound board will help now I know that is expensive but there are ways to get it done but we are still talking dollars but the more and further you go the more reliable the evidence is. That is what we all are going for the truth and the truth will set us free for lack of a better pun.