What instrument do you use to measure salinity?

[seashells]

I was wondering how everyone measures there salinity and how much they have spent on their test instrument.

[muck]

Refractometer. Bought it for $65.

[Joe Reefer]

+1

[marie]

Refractometer, it was a christmas present so I'm not supposed to know how much it costs

[andrewsk]

Aquatronica system.

[Midknight]

Refractometer, but do I have to say how much I paid?
Lets just say it was the only one I could find in town at the time.

[Psyire]

Aquatronica Salinity Probe & periodic checking via. Refractometer.

[seashells]

Don't have to give exact price. I have seen some threads saying they have a difference of .15 to .28 in salinity due to evaporation etc. I was wondering exactly what instrument they were using to get these numbers. BTW we use a refractometer here. Never got any consistency with a hydrometer. I was also wondering how important fluctuations to salinity are in the tank. What is a safe variation over a 24h period. In light of the necessary calibration of our devices which are better over the long run, Refractometer or Electronic meter?

Doug

[TheReefGeek]

Refracto & Hydrometer

I use the refracto once and a while to make sure my hydro is accurate, because i'm lazy and the hydro is easier to use.

refracto - $65

[StirCrazy]

was using swing arms but found out all 3 of mine were out by 0.003 when I got my refractometer.

Steve