How To Test Salinity In Water

this is just idle curiosity for me. but i have stumbled around the internet a few times looking for a brain dead easy way to test the salt content of water, and the process seems overly complicated, time consuming, and costly. i either don't know how to search for this, or it is just a complicated process.

again, i'm just curious. the fate of humanity does not lie in the balance.
for many years now, i have bought those fancy salts. one thing to do with them is make a salt brine. people purport 14000 uses for the salt brine, but i mainly use it as a mouth rinse. when you can not get a certain food taste out of your mouth, despite brushing, the salt brine does the trick wonderfully.

anyway, i have always wondered what the salinity of my little jar of salt brine is. naively, i thought there would be some testing paper strips, or some form of meat thermometer that you could just stick in the water, and it would give you a rough estimate [ ballpark sort of figure ] of the salt content. but alas, the internet has failed me. or, maybe, i have failed the internet. who knows. thanks.

 

Temporarily sold out, but they do exist:
http://www.filterwater.com/pc-536-9-salt-water-check-test-kit.aspx

 

https://www.amazon.com/Heartte-Sali...ty-Aquarium/dp/B01M7VQE67#feature-bullets-btf

 

guess i'm going senile in my old age. thanks!

 

Or saline...

 

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