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1909 Proc. Royal Soc. A. 82 246 This means, for the time, a power of 21 microwatts.

1914 R. Stanley Text-bk. Wireless Telegr. xvii. 261 Duddell carried out experiments to find the minimum power required to produce audible signals in a telephone receiver at different frequencies, and found that, while 430 microwatts were required at 300 frequency, only 7·7 microwatts were required at 900 frequency.

1994 Physical Rev. E. 49 3143 With a plane capillary, this may allow detection of infrared radiation at a microwatt level.