What hydrometer do you reccomend I use for my saltwater aquarium?

Answer 1

I think the floating glass ones (http://www.thatpetplace.com/pet/group/11320/product.web ) are more accurate, although they can be somewhat harder to read if you don't turn off everything that creates water movement in the tank or read from a sample in a separate container. These also break a lot easier.

The plastic units with the swinging arm are more durable (but even they can break), but there can be misleading readings if there's salt preventing the arm from swinging freely, or if air bubbles attact to the arm.

It's always a good idea to keep two on hand anyway - just when you need to do a water change, that's the time the "one" you have will decide to break. If you keep two, you have a backup.

Answer 2

Any hydrometer that you can get at the pet store with a swingarm will be fine. i have used both instant ocean and red sea hydrometers and either work fine.
http://www.aquariumguys.com/instantocean.html

http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=14696&N=2004+113761

Answer 3

i have an aquagarden type, the hydrometer + temp reader.

But i believe the "best" is the instant ocean one, that is probably the best one to get, but it is rather expensive.

Answer 4

the one that in equivalent to your tank