Pressure is measured by a barometer, which may be a mercury barometer, an aneroid barometer (the familiar household barometer), or an electronic barometer.
(Pressure; is measured; by a barometer) (a barometer; may be; a mercury barometer, an aneroid barometer (the familiar household barometer), or an electronic barometer)
Pressure a barometer
is measured may be
by a barometer
a mercury barometer, an aneroid barometer (the familiar household barometer), or an electronic barometer