Studies have been typically done using between 1µT and 500µT. There are some products that have intensities 10x or 100x this level but these are dangerous to use without a trained health professional. Do not use high powered pulsed EMF without supervision as it is dangerous. Anything below 500µT is believed to be completely safe to be used at home. Bemer claims that the lower intensities can often work better than the higher intensities depending on how healthy or sick your cells are.
The Healthy Wave original mat provides 300µT which is high compared to Bemer. Although it is more intense than the Bemer mat, it is still in the safe range for home use and a reasonable setting that will provide benefits for whoever uses it. There is no need for an accessory with a higher intensity because the mat already charges your body at a high yet safe level. You get the full benefits throughout your body instead of just at a local spot if you use an accessory.
The Healthy Wave Multi-Wave Mat provides 250µT at the maximum setting and you can set it to 10%, 25%, 50%, 75% or 100% of maximum.
The Bemer mat can deliver an intensity between 3.5µT and 50µT the B.Spot has a maximum intensity of 150µT