Conductivity sensor to use for DIY salinity meter? (DFR0300-H)

Hi,

I'm building a diy salinity meter for a salt water aquarium. Which conductivity sensor do you recommend (DFR0300 or DFR0300-H) ?

Aquarium salt water has the following properties:
On average, seawater in the world's oceans has a salinity of approximately 3.5%, or 35 parts per thousand.

Typical conductivity of waters:
Ultra pure water 5.5 · 10-6 S/m
Drinking water 0.005 – 0.05 S/m
Sea water 5 S/m

Thanks!