Magnet strength or power is determined by measuring the density of the magnetic flux lines. The instrument used to measure a magnetic field or the strength of a biomagnet (healing magnet) is called a gaussmeter or magnetometer.
There are two different units of measurement used when a measuring the density of magnetic flux lines - tesla and gauss.
Tesla (symbolized T) is the standard unit of magnetic flux density. Tesla is a large unit, and is used primarily in industrial electromagnetics.
Tesla was named after Nikola Tesla in 1960. Nikola Tesla was a Serbian-American scientist who invented the alternating-current (AC) electrical system. He also contributed toward the development of other modern-day electrical power systems.
When dealing with smaller magnets, such as those encountered in other consumer products and those used in Magnet Therapy, a smaller unit of flux density called gauss (symbolized G) is more commonly used.
Gauss was named after a German astronomer and mathematician by the name of Carl Friedrich Gauss. One Tesla is equal to ten thousand gauss or 10,000 gauss equals 1 tesla.
Gauss measures the density of the magnetic flux lines. The more magnetic flux lines per square centimeter, the more powerful the magnet, hence a higher gauss rating.
On the external surface of a magnet the magnetic field is the strongest at the north and south poles. This is where the magnetic flux lines are the closest together or more dense.
There are two types of gauss ratings – internal and external, also known as surface. Manufacturers measure and assign a manufacturer gauss rating which is typically the internal strength of the magnet.
The surface gauss rating, gives the strength at the external surface of the magnet. The surface gauss rating is usually much less than the internal gauss rating which is measured at the center of the magnet, where the magnetic field is the strongest. Sometimes the manufacturer will specify if the rating applies to the surface of the magnet.
When selecting a biomagnet (healing magnet), as in the use of magnet therapy, it is the surface gauss rating that we should be concerned with, since this is the strength of the magnet that the skin and body is in contact with. The same is true when selecting magnetic therapy jewelry. It is the surface gauss rating that you want to compare.
It can sometimes be difficult to acquire the surface gauss rating of biomagnets and magnetic jewelry, since manufactures often list the internal gauss rating of their products. This is because these numbers are higher.
When comparing products, be sure you are looking at the surface gauss ratings and compare with the same. For the convenience of our customers, we list the surface gauss rating in all our magnetic therapy product descriptions.