How often do you calibrate your refractometer?
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balajeek15
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Its time for me to buy a good salinity checker and after reading this forum I am not sure if i should go with Hanna or Vee Gee Scientific.
Hanna as per their instruction its a tester to test fresh mix salt water and not directly on the tank, what!
Hanna as per their instruction its a tester to test fresh mix salt water and not directly on the tank, what!
infinite0180
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My hanna salinity checker works great right in my tank. Matches my calibrated refrac as well as what ATI reported from my last ICP test. I trust it without a doubt...
Fallling
Active Member
Currently - never.
The little bolt for adjusting is stuck/rusted. Fortunately, it's stuck right at 35 ppt. Every once in a blue moon I do double check with calibration fluid that it hasn't changed, but it's been like this for 2 years now without any issues (I should really get a new refractometer).
Before this, I calibrated EVERY time- I had some bad experiences by skipping this step.
The little bolt for adjusting is stuck/rusted. Fortunately, it's stuck right at 35 ppt. Every once in a blue moon I do double check with calibration fluid that it hasn't changed, but it's been like this for 2 years now without any issues (I should really get a new refractometer).
Before this, I calibrated EVERY time- I had some bad experiences by skipping this step.
Bleigh
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Tastee
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I only test my salinity every few weeks and just calibrate my refractometer to zero with RODI water before each test. I run an Apex however so rely on it’s probe to alert me to salinity changes - only use it for trends not absolute numbers.
Westside Guy
Valuable Member
I calibrate my Red Sea refractometer almost every time I use it with RO which is what Red Sea recommends. I recently purchased some 35 ppt solution to confirm everything is correct.
Question for folks using various calibration solutions. How much do you trust those to be at 35ppt? Reason I am asking is because I was reading quite a bit lately on this topic (started out by researching how often to calibrate refractometer funny enough) and Randy Holmes-Farley has said on more than one occasion that he found that those calibration solutions can be off. Thats why he shared recipe for his mixture that gives 35ppt every time without any doubt. Great thing about it is that it requires 2 items (salt and RODI water) and it is really easy to make.
www.reef2reef.com
DIY Salinity calibration solutions
Randy, In light of another post on calibrating a conductivity meter, I decided to give it all a shot on my own system. I read through your article on DIY salinity calibration (http://www.reefkeeping.com/issues/2004-06/rhf/) and have a few questions for my simple brain. 1. Is the Brand MORTON...
www.reef2reef.com
Ditto
