indicator device造句

Panel mount displays and chart recorders are commonly termed'indicator devices'or'process monitors '.
Several passive indicator devices may be connected in series, but a loop must have only one transmitter device and only one power source ( active device ).
for an " Indicator device and means for mounting " was filed on January 9, 1956, by Andrew F . Kay, Covert B . Meredith, and Leonard M . Scholl of San Diego County, California, and granted on November 12, 1957.
It's difficult to find indicator device in a sentence. 用indicator device造句挺难的