The EMF Meter Option 445 installed in Field Master series instruments is used to measure all the EMF power within 20 MHz to 40 MHz band. The Isotropic probe (2000-1985-R) when connected to the USB port of the instrument reports the measurement power as a percentage of FCC (public or technician) or ICNIRP (public or technician) regulatory limits. Refer to 11410-01185 Technical Data Sheet for more information.