Sec.  15.243   Operation in the band 890–940 MHz.

   (a) Operation under the provisions of this section is restricted to devices
   that use radio frequency energy to measure the characteristics of a
   material. Devices operated pursuant to the provisions of this section shall
   not be used for voice communications or the transmission of any other type
   of message.

   (b) The field strength of any emissions radiated within the specified
   frequency band shall not exceed 500 microvolts/meter at 30 meters. The
   emission limit in this paragraph is based on measurement instrumentation
   employing an average detector. The provisions in  Sec. 15.35 for limiting peak
   emissions apply.

   (c) The field strength of emissions radiated on any frequency outside of the
   specified band shall not exceed the general radiated emission limits in
    Sec. 15.209.

   (d) The device shall be self-contained with no external or readily
   accessible controls which may be adjusted to permit operation in a manner
   inconsistent with the provisions in this section. Any antenna that may be
   used with the device shall be permanently attached thereto and shall not be
   readily modifiable by the user.