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Old 02-04-2012, 02:40 PM   #1
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Specific gravity testing

Hello,
Been reading up on equipment for marine setups.
I have a biorb and have purchased the marine kit.
I know I don't need any powerheads, protein skimmers, etc.
When it comes to the hydrometer, should this be replaced with a refractometer for a better reading? How unreliable are hydrometers?
Also if anyone has any suggestions for other items I should purchase, please let me know!
Thanks!
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Old 02-04-2012, 02:53 PM   #2
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Get a refractometer and never look back. If you are using a swing arm the problems are consistency and therefore accuracy. Very few people follow the directions to the T. A refractometer still needs to be calibrated, but it's rather easy. Many folks use a RODI water to calibrate 0, but I prefer getting a solution meant to calibrate at 35ppt (1.026 SG). It is usually sold as Salinity 53.0 mS Calibration Fluid.
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Old 02-04-2012, 02:54 PM   #3
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Calibration sounds complicated...
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Old 02-04-2012, 03:04 PM   #4
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Oh it is .
Put a few drops of fluid on the plate.
Look through the viewfinder to check the SG
Turn the set screw to adjust it to match the known value, if necessary
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Old 02-04-2012, 03:07 PM   #5
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Have someone who kows what there doing do it that's for sure.
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Old 02-04-2012, 03:09 PM   #6
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... I'm sure the fish guy at my lps will help! I hope!
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Old 02-10-2012, 03:51 AM   #7
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Gone for the needle hydrometer over the refractometer. Simply because of a huge difference in price! The needle is more accurate than the floating one so all good thanks guys!
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Old 02-10-2012, 06:18 AM   #8
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The hydrometer is no where near as accurate as the refractometer. I`ve seen folks here that there`s is off up to .005 . That`s a pretty big difference. It might have been cheaper but I promise you it is not as reliable.
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Old 02-10-2012, 11:09 AM   #9
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^^agreed Lfs here has refractometers for $50 well worth the investment. They also don't need replacing.
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Old 02-10-2012, 12:43 PM   #10
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I've seen ATC refractometers from $29 to $35 on eBay and the like. Some sponsors carry them in the $35 - $50 range. A six dollar swing arm is a problem. They are just not acdcurate.
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