The National Institute of Mental Health describes repetitive transcranial magnetic stimulation as a noninvasive approach that uses repeated magnetic pulses to stimulate the brain.
Read beyond the category name TMS and products described as PEMF can differ in field strength, waveform, pulse timing, coil geometry, intended use, and supporting evidence. The label magnetic stimulation alone is not enough to compare them.
Questions for a vendor Ask for the exact model, intended use, field specifications at the stated distance, supporting publications, and operating instructions. Evidence for one device or application does not establish evidence for another.
Start with a primary source The NIMH overview is a useful introduction to established brain stimulation approaches. A device-specific assessment requires its own documentation.