Testing salinity with hydrometer

[Nano_Man]

Hi everyone
How many people still use glass hydrometer and how accurate do u think they are ?

 

[Snoopy 67]

Probably very, as long as the temp is correct for the unit.

 

[X-37B]

Hi everyone
How many people still use glass hydrometer and how accurate do u think they are ?

Been using them for 30+.
More accurate than a refrac, imo.
TM at 77 reads 1.0265 in my system. At 80 it will read 1.0269. The difference is .0004.
Most tanks are run at 77-80 so the temp adjust is not really an issue and even if you use temp adjust its still simple to do.

Refractometers require calibration and are subject to user error, imo.

 

[jimk60]

Mostly all I use! The TM. Very accurate.

 

[Nano_Man]

Thanks for your info

Snoopy 67​

jimk60​

90's reefer​

 

[Randy Holmes-Farley Verified Community Expert]

Depends entirely on which hydrometer, and with any device, including hydrometers, it is worth checking the accuracy at least once with a good standard suitable for that device.

 

[KStatefan]

I use the Tropic Marin hydrometer.
I mixed up some of Randy's calibration solution to check it and mine reads 0.0002 high. I use this calculator to make temp adjustments.