My instant ocean hydrometer needle stucked ????

My instant ocean hydrometer needle stucked and not moving softly in air or water ????
so reading are not right .... what to do ?? ...

 

FIX: Soak in vinegar/water solution, then rinse with plain RO/DI freshwater.

BETTER FIX: Toss it and get a refractometer or lab-grade floating glass hydrometer. Those cheap hydrometers are just that- cheap and inaccurate.

 

for how long cause i tried it but still read inaccurate

 

+1 especially the "BETTER FIX", but make sure to buy some calibration fluid

 

+2 IMO, the better fix is the only option. Too many problems and too much risk.

 

+3, refractometer's are the way to go!

 

Do you rinse it after ease use in tap or RO/DI water, after each use?
HOw do you know it's wrong, float not moving at all, ever?


Refractometer?
Maybe I'll have to get one! ;-)

 

Soak it at least overnight in straight white vinegar.
It should be rinsed in water after each use and soaked overnight in vinegar once a week or every two weeks depending on how often you use it.