Metal inside plate differs to different chemistry coating on surface are tinny tiny trillions pyramids on surface of these plates. Pyramid has a funnel function shape V energy free in outer space such as Tachyon, Scalar, Chi, etc., pass over through the wide pyramid V side and out through the point tip _V collects, concentrates and amplifies subtle energy. Tesla purple plate gets scratches ( scratches, cuts and open wounds can have this plate covered with micro crystals pyramids and colors as a secondary healing aid within the bandage ) store food on preservative plate. Plates according to Nikola Tesla in purple and other colors can create a harmonizing field affecting body. Research online testimonies and on You Tube testimonies of what can be expected by using plates { ebay no allow web page links } one aspect is plate will not revert rancid food to normal taste, yet plate will preserve foods for a period of time. Can't expect plate to heal all aliments, yet is secondary heal aid in conjunction with proper medical treatments. Health benefits within parameters of testimonies. Meter measures energy field extends about 2 meters out of plate. Understanding research proper application of plates before hand buying plates and then expect some sort of spectacular results without research of other testimonies, is over doing it. This plate in powdered form mixed with another chemical compound is used in water purifiers Far Infrared filter.                                                                  Basically as an antenna radio waves gravitate to, so do EMF waves gravitate to metal plates instead of passing through body. Energy from outer space, orgone and / or scalar through pyramids delay decay slow down time ( space travel 15 years at near speed of light equals 80 years on earth ) is why Pharaohs insisted on preserving corpse skin inside pyramids; applies to preserving foods; a test without meters is put bit of food on plate and bit of food on another area, not near plate to test which bit food decays faster. Use this plate same way as method used to heal is wrap injured area with aluminum foil energy form outer space heals area, so use this plate this way too; can research this on line Aluminum Foil Helps Soothe Everyday Pains And Aches and on teeth too, on You Tube. Heal methods at home Dr Mercola dot co m web page articles. May make this plate into an Orgone Accumulator with colored papers. Colors heal, colored foods heal, as an example; yellow food heals yellow color stomach; green food vegetable { not artificial food coloring } heals liver; research on line You Tube to assemble Orgone Accumulator and on line search colors of organs colored anatomy chart.                                                                                                                        There's different logos for different companies purple plate, the plate shipped is how plate is before stamp a logo, so is a plain plate, no stamp, is thick, inflexible. The other item purple rainbow holographic 3 thin plates has the same surface on all plates, the surface chemical compound is why Tesla expounded the plate, then invented purple for enhance energy field, purple, any color or plain uncolored plates all have same energy, can use plain uncolored to preserve food, etc. purple, colored is for human body. 3 thin flexible plates, so flexes in pocket when person flexes