Cigars International shows you the most effective way to calibrate your hygrometers!
How to Calibrate a Hygrometer
A hygrometer is an instrument that
is used to measure the humidity of
the air inside your humidor.
Not all hygrometers are perfectly
accurate all the time, which is why
its crucially important to
calibrate them every 6 months.
A hygrometer reads in percentage
from 0-100%. The optimum humidity
for cigars however, is 70%.
There are two types of hygrometers,
analog and digital. Although analog
hygrometers are most common,
digital hygrometers are far more
accurate and will give you a more
In order to effectively calibrate
your hygrometer, you’ll need to
preform a "Salt Test".
When the proper amount of salt is
mixed with water, it omits exactly
75% humidity. This mixture will
create the perfect environment to
calibrate your hygrometer. If done
properly, your hygrometer will read
75% when finished. If not, you’ll
need to adjust it.
Items you’ll need: table salt,
distilled water, a bottle cap, a
Ziploc bag, and a small flat-head
Step One: create a salt and water
mixture. Fill the bottle cap 3/4
full with table salt.
Take a few drops of distilled water
and pour it onto the salt. You are
looking for a cake like
Be careful, too much water can
dissolve the salt!
Step Two: place your hygrometer and
salt mixture in a Ziploc bag. Seal
the bag, leaving a little bit of
air in it and wait 12 hours.
Step Three: after 12 hours have
passed, jot down the reading of the
hygrometer, while it’s still in the
bag. If it’s not reading 75%,
you’ll need to adjust it.
Step Four: adjusting your
hygrometer. Take a small
screwdriver and insert it into the
slit in the back of the hygrometer.
Turn the slit until it reads 75%.
Digital hygrometers however, are
far more accurate and very rarely
have large discrepancies. If by
chance a mismatch does occur, and
the hygrometer does not have an
adjustment feature, simply note the
variance on a piece of paper and
toss it into the humidor so that
you’ll always remember the unit is
+ or - 75%.
Congratulations, your hygrometer is
now calibrated to ensure a near
perfect environment for your