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Old 07-22-2004, 12:57 AM   #1
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Is A Refractometer Really More Accurate?

I've almost got my SW tank ready to go. I'm not sure whether to go w/ a hydrometer, or if a refractometer is really worth the investment. Are the Refrac's much more accurate?
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Old 07-22-2004, 12:58 AM   #2
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YES!
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Old 07-22-2004, 01:04 AM   #3
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There are 3 types offered: refractometer, refrac w/ calibration dial, and refrac w/ light. Which one is the best choice?
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Old 07-22-2004, 01:12 AM   #4
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It's up to you how much you want to spend really... I personally don't see the need for anything other than a basic refractometer. The dial just means you won't have to use a screwdriver to calibrate, and the ones with light seem way too expensive to me.
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Old 07-22-2004, 01:35 AM   #5
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Is it more accurate than a floating hydrometer?
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Old 07-22-2004, 02:05 AM   #6
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Is it more accurate than a floating hydrometer?
Infinately!!

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Old 07-22-2004, 02:09 AM   #7
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They are worth the $$$ IMO.
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Old 07-22-2004, 06:58 AM   #8
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buy it!
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Old 07-22-2004, 09:50 AM   #9
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If you want to know EXACTLY what your salinity is then yes its worth the money. Can you be sucessful with out one? Sure. I used a standard swing arm hydromoter for years until just recently I won a refractomoter at a reef meeting. Now that I have the refractomoter I tested my hydromoter and found it to be off by approx .0025 so if I used the hydromoter to have a salinity of 1.025 it was acutally 1.0275 per the refractomoter.

If your not fimular with how the refactomoter works it uses a prizm inside a tube with some optics mounted on one end and a slanted surface for the water to be placed on the other. The refractomoter will measure how much the light is 'refracted' thru the prizm. Light will bend a predictable amount based on specific levels of salt. A hydromoter simply measures the density of the water and predicts the salt amount upon that.
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Old 07-22-2004, 10:17 AM   #10
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check drsfostersmith.com for refractomers. do a search on it. they have one for like $42.
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