hydrometer

[zacheyp]

i bought a hydrometer but have no idea how to use it, HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[2Reefnutz]

How to Use a Hydrometer for Fish Tanks | eHow.com

 

[scottayy]

I believe there are different kinds. The kind I had a while back I just floated in the aquarium and read the marking where the water level was. Kind of hard to read, IMO.