Refractometers and Salinity Measurement

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ReefSparky

New member
Joined
Sep 12, 2008
Messages
1
I realize this is an old thread, but what's the difference b/w calibrating your refractometer with some "known concentration" fluid; as opposed to simply using RO/DI water to calibrate it to zero? The RO/DI water is free, and there's zero unknown. Am I missing something?
 

Kurt_Nelson

Well-known member
Joined
Apr 26, 2007
Messages
427
Location
Seattle-ish, WA
Linearity. Just because it reads zero at zero doesn't mean it reads 35 ppt at 35 ppt. And we keep our tanks closer to 35 than zero, so calibrating at zero really doesn't help much.
 

spllbnd2

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Joined
Dec 6, 2004
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Location
Edmonds

1fishkeeper

Keeper of the algae
Joined
Jul 9, 2008
Messages
329
Location
Spanaway, WA
Ok quick question Im sure it has been answered before but Im feeling kind of lazy to go look for it. How long does the pinpoint stay good for after its been opened?
 
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