This is not easy, so in order to undertake things like PEMF requires attention and intelligence. It is definitely not for everyone. Many things, important things, simply cannot be quantified. Let me give you an example:
Pain
There is no way to directly measure pain. No matter what anyone tells you, it can’t be done. Yet about 1 in three adults suffer from it. And we cannot measure it. Please do not send me endless links to fraudulent “pain-o-meters”, such things do not work.
Yet people know when they are in pain, when they are not, when it gets better, when it gets worse, when it changes in nature, and many other things. Some people are much more aware than others, some ignore it, some block it with medications, etc. etc. Then of course there is the major issue of placebo effects.
Some people can monitor pain more or less intelligently, some can not. if you are using something like PEMF on something like pain, you need to pay a lot of attention and try to make objective observations, probably keep a log or journal.
Other things can be directly quantified, like blood pressure. You can monitor this, or someone else can monitor it for you, track changes, and use specific, repeatable numbers to guide treatment.
Some things like exercise can start by making you feel worse, others have no change in sensation at all.
With all of this said, most things related to health are just hard to get a full grasp and a quantitative number for progress. This is why some people just need to place their health into the hands of someone else, such as a physician.
Efficient PEMF will often not have a direct sensation. Effective PEMF may take hours or days or weeks. Tissue just must be allowed time to heal and regenerate, and PEMF evidently accelerates this process, but it still takes time. Different injuries, in different tissues, for different people, at different ages, under different conditions, will have different time courses of healing and recovery. The effects can be profound or subtle.
With our present state of knowledge, putting a number on these things is essentially impossible. So, people have to use PEMF thoughtfully and intelligently, or they will not get as much out of it, nor will they appreciate what they do get out of it.
So, if you are using a PEMF system, then for your individual injury or need you need to find a way to track your progress and determine whether or not you are getting a benefit. This takes a fair amount of work and attention. Fortunately, PEMF is so beneficial for so many conditions that it is sufficient to get PEMF in a clinic two or three times per week, for 15 to 30 minutes, even if it is a crude waveform.
But if you are willing to develop the skill of using PEMF and assessing and tracking your progress, then you can get even better outcomes using much lower power, highly efficient systems on a daily basis.