&ampamp;amp;amp;amp;ltscript language=JavaScript src="http://rotator.adjuggler.com/servlet/ajrotator/327365/0/vj?z=designw&ampamp;amp;amp;amp;ampdim=195519&ampamp;amp;amp;amp;ampabr=$scriptiniframe"&ampamp;amp;amp;amp;gt&ampamp;amp;amp;amp;lt/script&ampamp;amp;amp;amp;gt&ampamp;amp;amp;amp;ltnoscript&ampamp;amp;amp;amp;gt&ampamp;amp;amp;amp;lta href="http://rotator.adjuggler.com/servlet/ajrotator/327365/0/cc?z=designw"&ampamp;amp;amp;amp;gt&ampamp;amp;amp;amp;ltimg src="http://rotator.adjuggler.com/servlet/ajrotator/327365/0/vc?z=designw&ampamp;amp;amp;amp;ampdim=195519&ampamp;amp;amp;amp;ampabr=$imginiframe" width="728" height="90" border="0"&ampamp;amp;amp;amp;gt&ampamp;amp;amp;amp;lt/a&ampamp;amp;amp;amp;gt&ampamp;amp;amp;amp;lt/noscript&ampamp;amp;amp;amp;gtA sensor is a device which measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. A sensor's sensitivity indicates how much the sensor's output changes when the measured quantity changes. For accuracy, all sensors need to be calibrated against known standards.