How to use a Hydrometer
How to use a Refractometer
1
Submerge
hydrometer
in water
until it’s
completely
filled with
water.
1
Rinse platform and the cover with
fresh water to clean refractometer
before use.
2
Gently close cover over
3 drop of water.
2 Gently tap on flat surface
to remove air bubbles.
3
Put a drop or two of river
water on the platform.
Needle
will rise based
Look into eyepiece towards
4
on water
a light source to get your
density.
reading based on light
Read where
refraction.
the needle
stops in
In this
Salinity ppt.
Read right side of scale, where the example,
Record this number in
two colors meet, in parts per
reading is
ppt on data sheet.
thousand (ppt shown as per mille ‰) 35 ppt.
In this example, reading is 24 ppt.