[FS]: Refractometer for Sale: Fourways

Discussion in 'Hardware For Sale/Swap' started by munch, 22 Jul 2014.

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  1. munch

    munch

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    Hardware for sale
    Thread title:
    Refractometer for Sale ​
    Location:
    Fourways ​
    Shipping or Collection only:
    Collection. Shipping negotiable if not in Joburg at your own expense. ​
    All sales to be conducted on the thread.
    • I agree
    Photo's and description/list of items for sale:
    Portable refractometer with carry case, calibration screwdriver and syringe - R400 ​
    Notes:
    Easily calibrated with distilled/RO water.

    Manual focus.

    Used to measure salinity/specific gravity of water.

    More accurate than a hydrometer.

    Can also used in brewing(wine, beer etc)

    Syringe included to take samples ​

    refractometer.JPG
     
    Last edited: 24 Jul 2014
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  3. brazer

    brazer

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  4. hazelbag

    hazelbag

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    Hi, how old is the refractometer?
     
  5. munch

    munch Thread Starter

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    It's about a +-1 year old
     
  6. Marine Bart

    Marine Bart

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    will give you R300 and you post it to me
     
  7. munch

    munch Thread Starter

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    Sorry new price was over R900
     
  8. puffer fish

    puffer fish

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    will give you 400 if you post it to me , does it have auto temp adjust ?
     
  9. munch

    munch Thread Starter

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    I am not certain if it does, as a rule I check all my refractometers using distilled water before use anyway including my red sea one.

    I will accept your offer if it still stands.
     
  10. puffer fish

    puffer fish

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    offer stand if you can just check if anywhere on it if says anything about auto temp adjust or give me a model number or name
     
  11. munch

    munch Thread Starter

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    I just checked and there is no text or writing on the device at all. The only writing in on the bag that reads "Portable refractometer".
     
  12. puffer fish

    puffer fish

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    crap mmmm im not sure now
     
  13. munch

    munch Thread Starter

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    That's fine. However I will say I have a red sea refractometer which does have ATC and when both are calibrated they give the same reading.

    I originally calibrated the red sea one at 22-25 degree room temperature as per the manual. The manual also states that operating temperatures are between 15 and 35. However when I took a reading of the same tank water the following day at 17 degree room temperature my reading was off the charts. +-45 PPT despite using it at the correct temperature range and despite the device having ATC. ATC only works when room temperature is within a few degrees of the calibrated temperature. I took this up with Red Sea support and their answers have been less than satisfactory and the conclusion is to never trust any refractometer if not used at the same room temperature you calibrated at. This is why I as a rule now calibrate at the current room temperature and measure straight after.

    This is not meant to change your mind however just an FYI for you and everyone else on how refractometers work. People have a misconception especially about ATC and believe it corrects everything. As I stated it only corrects within a few degrees of calibration temperature. Also people often dip the device in the tank which changes the temperature of the device affecting readings. Even handling the device too much will warm it up affecting readings. I have proven this with my red sea refractometer. However if you calibrate with every use you can be sure you are getting the right readings.

    I still intend creating a post elsewhere to discuss how people use and calibrate their refractometers and have people post their findings.
     
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