Tropic Marin High Precision Hydrometer

[EricR]

The values in the body of the table appear to be in PSU,,, same-ish as ppt (salinity).
If your hydrometer reads 1.0260 (specific gravity) that would've meant 34.50 PSU at 25d C but at 24d C means 34.06 PSU.
***not a huge difference but I guess at lower temperatures your hydrometer reading will be slightly high

Personally, I run my tank at 77d F anyway and don't even worry about slight temperature variations when using the TM hydrometer, but that's just me

 

[Rst]

The values in the body of the table appear to be in PSU,,, same-ish as ppt (salinity).
If your hydrometer reads 1.0260 (specific gravity) that would've meant 34.50 PSU at 25d C but at 24d C means 34.06 PSU.
***not a huge difference but I guess at lower temperatures your hydrometer reading will be slightly high

Personally, I run my tank at 77d F anyway and don't even worry about slight temperature variations when using the TM hydrometer, but that's just me

Eric, thank you for giving some meaning to this table. I believe that the main use for me would be when I am mixing up a fresh 44gal pail of new (cold) salt water and the temperature of this mix is much colder than my display tank. (In the winter months in Canada, my RO mixing water is stored and made in the unheated garage)

I now can see how to apply and use this table. Problem is that the answer at the lower temperature is given in PSU units rather than the preferred answer that would have been way more useful if it was given in specific gravity units. Unfortunately, this hydrometer only reads in specific gravity units and not in PSU units.

 

[KStatefan]

Eric, thank you for giving some meaning to this table. I believe that the main use for me would be when I am mixing up a fresh 44gal pail of new (cold) salt water and the temperature of this mix is much colder than my display tank. (In the winter months in Canada, my RO mixing water is stored and made in the unheated garage)

I now can see how to apply and use this table. Problem is that the answer at the lower temperature is given in PSU units rather than the preferred answer that would have been way more useful if it was given in specific gravity units. Unfortunately, this hydrometer only reads in specific gravity units and not in PSU units.

If you do not want to use the chart you can use an online calculator to get the adjustment in S. G.

 

[Rst]

Yes this calculator is more suited to obtaining the corrected salinity in specific gravity terms.
Thanks again,
Ron

 

[Narideth]

I have a whole thread all about how I discovered almost by accident that even after calibrating with proper calibration fluid that my refractometer was reading .07 too low on salinity and nearly crashed my tanks.

The TM hydrometer was accurate according to outside tests I had done, and it comes in this nice case that is pretty protective. It's BIG though. I can't float it in any of my tanks without it touching the bottom so I needed the external container. I feel confident in using it as my base, and I run my tanks right around 80 degrees so it's not a huge temperature difference to account for on the temp adjustment table.