Salinity:Which method of measuring do you trust more

Discussion in 'Other Reef Talk' started by Thales, Nov 9, 2005.

  1. Thales

    Thales Past President

    A just calibrated refractometer or a pinpoint salinity monitor that was calibrated with two different solutions?
  2. jimsar

    jimsar Guest

    I use a refractometer. I guess I can also use my beerkmaking hydrometer.

    I'll never use a plastic float hydrometer again. Mine is so inaccurate. In restrospect, I loaned it to Panzer Tank the other week. It's now his, as far as I'm concerned.
  3. Raddogz

    Raddogz Guest

    Refractometer is what I use. I can't comment on the salinity monitor as I have never used one.
  4. badpacket

    badpacket Guest

    Are you calibrate with RO/DI?
  5. bareefers

    bareefers BOD

    I used a salinity monitor but its tricky becuse of the stray voltage, I prefer a float type.
  6. Thales

    Thales Past President

    Hey guys, thanks for the responses, but I'm not looking for opinions on which to choose. I have both and they give different readings even after they have both been calibrated. I am trying to decide which to trust.

    Can someone bring their refractometer to the meeting? :D
  7. capescuba

    capescuba Supporting Member

    Am I the only one living in the dark ages then with a hydrometer?
  8. jedininja

    jedininja Guest

    i would tryst the refractometer calibrated with distilled water most. Electronic can be off, but physics cant be. a certain sg will bend the light at a certain angle, no changing that.

    How much do your results differ?

    Capesuba, a refractomere is probably one of the best investments I ever made in this hobby.
  9. Thales

    Thales Past President

    1.020 with the probe, 1.026 with the refractrometer
  10. vapormd

    vapormd Guest

    I'm surprised there's that much of a difference between the two! IMO, I'd try and borrow a few refractometers, calibrate them with RO/DI and then see how they compare. Do both the salinity probe and refractometer have temp compensations?
  11. bareefers

    bareefers BOD

    I ditched my pinpoint unit in favor of a refractometer.
  12. bareefers

    bareefers BOD

    I concur on all statements.. prefer physics over electronics and our refractometer was one of the best investments to date :)
  13. jedininja

    jedininja Guest

    Wow, that is a huge difference. So what does the hydrometer say? :)
  14. bookfish

    bookfish Guest

    I agree w/ jedi, the physics behind a refracto are pretty straightforward.
  15. Thales

    Thales Past President

    Jim - let me borrow your Refractro!
  16. jedininja

    jedininja Guest

    Hey Rich, bring a sample of your water and I'll bring my refractometer.
  17. Thales

    Thales Past President


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