aquatic garden hydrometer

[hollywood11892]

ok so i got a new hydrometer after my post bout the in tank one and its a bobber with thermometer under, how accurate are these? cuz it said i was at about 1.020 so jsut a bit under so i added more salt

 

[David S]

not very good,get a refractometer

 

[carey]

Cheap one that works great

Salinity Refractometer 0-10% ATC Aquarium Salt Water | eBay