setting refracto

[tony_caliente]

If one were to test their DT water with a hydrometer, then use the DT water to calibrate the refractometer, would that work? It would assume that the DT water's salinity is capable of support life, but I don't think it's a bad idea. But would love to know what you all think.

 

[cr500_af]

Tony_Caliente;655401 wrote: If one were to test their DT water with a hydrometer, then use the DT water to calibrate the refractometer, would that work? It would assume that the DT water's salinity is capable of support life, but I don't think it's a bad idea. But would love to know what you all think.

It would just mean that your refractometer is as accurate as a hydrometer, which means nothing IMO if you don't start with a known number. If you checked your DT water with a known calibrated refract, then you could certainly calibrate another one with it.

 

[jmaneyapanda]

Hydrometers are notoriously inaccurate, incalibratable, and subject to erroneous readings quite easily. It's is not propaganda that they are problematically inaccurate. Sure, some may hold true, but a great number oriented don't.

Refractometers should be calibrated with calibration fluid. Truth be told, our refractometers are not made for seawater. They are actually are for NaCl water. Therefore, they have a different slope to their accuracy curves. That is why the setpoint for calibration is supposed to be as close to typical values as possible. (35 ppt rather than 0 ppt).

 

[grouper therapy]

jmaneyapanda;655455<u>[B wrote: ]Hydrometers are notoriously inaccurate, </em></u>[/B]incalibratable, and subject to erroneous readings quite easily. It's is not propaganda that they are problematically inaccurate. Sure, some may hold true, but a great number oriented don't.

Refractometers should be calibrated with calibration fluid. Truth be told, our refractometers are not made for seawater. They are actually are for NaCl water. Therefore, they have a different slope to their accuracy curves. That is why the setpoint for calibration is supposed to be as close to typical values as possible. (35 ppt rather than 0 ppt).

No they aren't

 

[jmaneyapanda]

grouper therapy;655461 wrote: No they aren't

Yes they are. Yours may be accurate, but as a whole, they are.

 

[grouper therapy]

jmaneyapanda;655469 wrote: Yes they are. Yours may be accurate, but as a whole, they are.

No they aren't Just busting ,but interestingly enough I have earned three different corals proving to the owners that their refractometer was accurate. All three were loading it wrong and getting bad readings due to small bubbles hiding on the float.

 

[rbredding]

dems fightin' werds!

 

[cr500_af]

I've always heard that they were inaccurate (and have witnessed it), but I've been curious about whether a hydrometer will always read consistently if used correctly, or if there is some chance that the readings could change long-term. IOW, if it reads right will it always? I don't see any way it could change unless the needle somehow took on water, and then it would fail entirely... but I'm always open to learn by correction.

Since I've never weighed my salt (and rarely make up the same amount each time) I use a hydro to get close (for speed) and then use a refracto at the end.

 

[db366]

I'd like to talk to someone who has actually had there tank crash due to a faulty hydrometer.. I mean if it was really that off you would know that you would need to test it with a back up..

 

[grouper therapy]

:confused2:I would think that those who have so much confidence in the purity of products provided by "hobby" related business would have the same for the instruments provided by the same companies.

 

[ralph atl]

I use a good refractometer & calibrate it with pinpoint solution at 35. Solution is like a buck on line.

and Jeremy is completely correct...this time, lol.

 

[grouper therapy]

mysterybox;655554 wrote: I use a good refractometer & calibrate it with pinpoint solution at 35. Solution is like a buck on line.

and Jeremy is completely correct...this time, lol.

Ralph you are not helping Jeremy's case ,after a bottle of wine the refractometer is inaccurate:lol2:

 

[ralph atl]

Lol

 

[cr500_af]

grouper therapy;655584 wrote: Ralph you are not helping Jeremy's case ,after a bottle of wine the refractometer is inaccurate:lol2:

Sig line material, that is.