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.