magnetic sensor

http://www.ssec.honeywell.com/magnetic/

http://sensors-transducers.globalspec.com/LearnMore/Sensors_Transducers_Detectors/Electrical_Electromagnetic_Sensing/Magnetic_Field_Sensors

another Magnet or a compass might suffice

joshua

Hi, not existing this,

the magnetic dust you collect with your clothings will be likely more magnetic than the magnetic field that is generated from the very small currents inside our body.

Give me 200K$ and I will build you a system.

RHABE

Absent any magnetic sources nearby, the biggest magnetic field around or inside the human body is the Earth's own magnetic field, which is about 55,000 nanotesla = 55 microtesla = 550 millegauss = about 1/2 gauss. (A Tesla = 1 Weber/meter square = 10,000 Gauss). But the Earth's field is essentially constant. Electric currents flowing in axons and dendrites within the human body produce changing magnetic fields, which can be detected and separated from the steady Earth's magnetic field - akin to separating AC signals from DC signals.

The problem is the very small magnitude of these neuronal currents and their associated magnetic field. Some researchers have used "SQUID" sensors to detect these fields.

http://en.wikipedia.org/wiki/SQUID

fild which you want to measure is very less that can be measured but with inexpensive sensor just impossible. and one more thing when you measure this field it should measure in standard condition. without dust with full antisatic without any magnetic material with body ect ect.

Something that might help, if not quantitative, al least qualitative. I heard of the Kirlian effect, a kind of halo around a living body, under some high frequency oscillations. Anyway, I have seen the pictures, and they remained in my memory for more than 25 years.