After this inputs about okm, I have to say bye my ilusion to buy a rober c from okm.Will be good wait for another realy good device.
HiiiQ said:OKM makes only magnetometers and dowsing rods. Both equally worthless in treasure hunting/archeology. The big boys prefer something with big coils and lots of power...
http://www.geo-western.com/em/em.htm