Asbestos TEM air sampling uses electrons to create images, fine crystal patterns and analyzes the chemical makeup of fibers or structures encountered in the air sample.
The machinery required is not very mobile and is very sophisticated.
It magnifies objects at least 20 times their actual size. This method also is asbestos-specific. So specific that it can indicate the type of asbestos fibers in the air sample. This method is often used when there are interfering fibers which cause the PCM results to be very high but asbestos fibers are not suspected as the cause of their high-fiber count.
This method is most appropriate for final clearance samples either due to regulation (AHERA) or liability issues. By law, schools, etc., must use this method. This is also most appropriate for litigation and real estate transactions.
Asbestos TEM samples are considered the gold standard for asbestos air testing.