Testing homemade salinity calibration fluid?

[johnd651]

i was wondering how would you go about testing homemade calibration fluid to make sure it is actually at 35ppt?

i got a little bored yesterday, and ended up making a 3.714% solution of >99% NaCl and ro/di water. after i was done, i thought about it and realized with nothing to compare it to, how should i know that it is actually right?

also how long will a solution like this last? i dont actually need it for now, i kind of just got really bored and made it

 

[eugeneK]

there is probe solution that you can buy premaid from pinpoint and other vendors. Its very cheap.