What are the 2 advantages of aneroid barometer?

TAn aneroid barometer,
invented by the French 19th century engineer and inventor href="http://en.wikipedia.org/w/index.php?title=Lucien_Vidie&action=edit&redlink=1">Lucien
Vidie, uses a small, flexible metal box called an aneroid cell. This aneroid
capsule (cell) is made from an href="http://en.wikipedia.org/wiki/Alloy">alloy of href="http://en.wikipedia.org/wiki/Beryllium">beryllium and title="Copper" href="http://en.wikipedia.org/wiki/Copper">copper. href="http://en.wikipedia.org/wiki/Aneroid_barometer#cite_note-8">[9] The
evacuated capsule (or usually more capsules) is prevented from collapsing by a strong
spring. Small changes in external air pressure cause the cell to expand or contract.
This expansion and contraction drives mechanical levers such that the tiny movements of
the capsule are amplified and displayed on the face of the aneroid barometer. Many
models include a manually set needle which is used to mark the current measurement so a
change can be seen. In addition, the mechanism is made deliberately "stiff" so that
tapping the barometer reveals whether the pressure is rising or falling as the pointer
moves.he aneroid barometer is more durable and compact, and much easier to read. The
only particular advantage of a mercury barometer is that it's a direct measurement --
there's no calibration involved. If you can measure the height of the column above the
pool and you know the density of mercury, you have the
pressure.

Aneroid barometers have a mechanical adjustment
for altitude that allows the equivalent sea level pressure to be read directly and
without further adjustment if the instrument is not moved to a different
altitude.