Does 1.026 SP = 35 PPT?

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I always thought 1.026 = 35. No matter how much I calibrate/retest, etc. I can not get 1.026 = 35 ppt on my refractometer. I always end up with 1.026 = .34.

IMG_8244.jpeg


Forgive the blurry picture. I think that is a function of focusing it for eyesight and then trying to take a photo with my camera. It reads 1.026 with a sharp line and and about 34.5 PPT. When I get my water to 1.026 the refractometer always reads just below 35 ppt or even 34 ppt.

Is it a function of my tank water being different than the refractometer stated temp? If so, should I try for SG or PPT measurement?
 
Tidal Gardens
fftfk said:
I always thought 1.026 = 35. No matter how much I calibrate/retest, etc. I can not get 1.026 = 35 ppt on my refractometer. I always end up with 1.026 = .34.

IMG_8244.jpeg


Forgive the blurry picture. I think that is a function of focusing it for eyesight and then trying to take a photo with my camera. It reads 1.026 with a sharp line and and about 34.5 PPT. When I get my water to 1.026 the refractometer always reads just below 35 ppt or even 34 ppt.

Is it a function of my tank water being different than the refractometer stated temp? If so, should I try for SG or PPT measurement?
Click to expand...
At 78 degrees fahrenheit, 35 (ppt) = 1.0264 (specific gravity)
 
Here's a good calculator

reefapp.net

Salinity calculator

A unit converter for calculating salinity in marine aquariums. The calculator supports conductivity (mS/cm), salinity (PSU og ppt), density (g/cm³) og specific gravity.
reefapp.net reefapp.net
 
Deltec
Tidal Gardens
BRS
Top Shelf Aquatics
Sleeping Giant said:
looks like it's also not level
Click to expand...

lol - if there is a trick to get a photo looking through your phone through the refractometer pointed at the light bulb and get it level please let me know!

I guess I could have used the alignment tool in photos to make it appear level.
 
fftfk said:
lol - if there is a trick to get a photo looking through your phone through the refractometer pointed at the light bulb and get it level please let me know!

I guess I could have used the alignment tool in photos to make it appear level.
Click to expand...
Yeah, it's not like the line stays horizontal if you tip the refractometer... It reads the same even if you're laying down (although I don't know why you're testing salinity laying down ;) )
 
A brine refractometer (which is most common in the hobby) will not line up 35 ppt and sg = 1.0264, while a true seawater refractometer will.
 
Top Shelf Aquatics
I think this answered my question. When people say they target 35 ppt or 1.026 SG it is assumed they mean at 78 degrees as both measures are affected by temperature.... correct?
 
SG is affected by temp and salinity. Salinity is not affected by temp. Its units are g/kg. SG is basically density of the seawater with g/l as the unit. A liter of water at 78F is not a liter of water at 70F.
 
Chewy.com
mook1178 said:
SG is affected by temp and salinity. Salinity is not affected by temp. Its units are g/kg. SG is basically density of the seawater with g/l as the unit. A liter of water at 78F is not a liter of water at 70F.
Click to expand...
Specific Gravity is unitless
 

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