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Post by gotareef on Sept 27, 2014 10:22:26 GMT -5
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Post by BriMc on Sept 27, 2014 11:10:39 GMT -5
That is way to dramatic of a test. I do agree that is you are under different NM's of light yes it effects the readings of the prism but how often do you check your salinity under strict blue, red, yellow, or green lighting? This is what the test shown is projecting. If you read the instructions to your refractometer it states to read your refractometer under sun light or incandescent lighting under the assumption you would calibrate it under the same lighting. One other fact that the test negated to state was that the higher the content (to a point) of what is being measured the less accurate the reading of the refractometer. Why they are referencing a refractive index of 1.325 to 1.350 is beyond me as our tanks range between 1.019 and 1.026 again the higher the refractive index the less accurate the refractometers we use on out tank are. I emphasize " that we use in our tanks" because there is a huge difference in the ability of the refractometers we use and spend 50 bucks on and the ones used in industries that cost ten+ times more. Just some food for thought, and it was an interesting read.
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Post by gotareef on Sept 27, 2014 12:02:13 GMT -5
my guess is my living room reading will be different from my basement reading.
problem is I calibrated it with ambient sunlight in my living room. I am testing 3 tanks, 2 with lighting thats not even close to the same in color in my basement and bedroom. I never even thought about it...
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Post by BriMc on Sept 27, 2014 12:44:14 GMT -5
Now you have me wondering. I will do a test in a minute in four different lighting environments.
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Post by gotareef on Sept 27, 2014 12:51:08 GMT -5
thats what I am doing  |
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Post by gotareef on Sept 27, 2014 12:58:42 GMT -5
calibrated refractometer to living room light like I always do... tested water from my coral tank in the basement.
basement light says .025, living room lighting says just over .026
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Post by jasonandsarah on Sept 27, 2014 13:55:10 GMT -5
Ty for this discussion. I was wondering why mine always seems to be out of calibration and it's because sometimes I use a window and other times (mostly at night) I use my tank lighting. Once again awesome even just to get the wheels turning. I tend to throw away instructions because I'm stupid. Sent from my SM-N900R4 using proboards |
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Post by jmerr86 on Sept 27, 2014 15:09:53 GMT -5
I have a true day light in my kitchen and that's were I check every time
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Post by speedyron on Sept 28, 2014 7:50:14 GMT -5
it should be fine as long as check ur readings under the same light as u calibrate the instrument. so if you change out the bulb in the room or lamp you are using to read the instrument under just recalibrate the meter
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Post by gotareef on Sept 28, 2014 9:01:19 GMT -5
it should be fine as long as check ur readings under the same light as u calibrate the instrument. so if you change out the bulb in the room or lamp you are using to read the instrument under just recalibrate the meter unless you are trying to get an accurate reading.... if refractometer is calibrated using bluer light, it wont be give you the true salinity. it may only be off a little bit and wont matter most of the time unless you have a strict sps tank or trying to do a hyposalinity qt. that +/-.01 or more makes a big difference. especially when you are talking about dropping salinity to .008-.009! like stated in the article "its the difference between freshwater and saltwater" |
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