As esd occurs in a microsecond you need to be able to retain the reading.
How to test esd mat with multimeter.
Rtt testing for esd resistance per ansi esd s4 1.
An antistatic mat uses a conductive plastic material to safely drain static electric charges away from a work surface.
The ansi esd association standard used in the united states to test that an esd mat is static dissipative is ansi esd s4 1 worksurfaces resistance measurement s.
Use a digital multimeter to check for esd.
This requires the use of a surface resistivity esd meter to perform both resistance top to top rtt and resistance to groundable point rtg tests.