D and D Portable Refractometer

£36.95   ( found this item cheaper? We'll  price match  it! )

Take the guesswork out of your salinity readings with this quality refractometer . Automatic Temperature Compensation model with carry case , pipette , scewdriver and instruction sheet. Want more info?

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This product has an average rating of 11 / 5, based on 11 customers. Read the reviews in full
 

What’s different between our NEW refractometer and others you might ask?
 
Almost all, if not all, of the refractometers currently available to the aquarium hobby are designed for measuring saltwater (sodium chloride or brine solution) and not true ‘seawater’. Although seawater is mostly sodium chloride it also contains other elements such as magnesium and calcium that change the refractive index slightly and will give a slightly different result.
 
The most common symptom of this difference in refractive index can be seen when mixing up salt as per salt manufacturer’s instructions and achieving a solution strength where it appears, through testing, that the levels of elements are lower than stated by the manufacturer. In actual fact all of the levels are low as the salinity is not as high as the aquarist believes – we have all seen low Ca or Mg for a given SG with almost all brands of salt.
 
It turns out that a 35ppt solution of true seawater has the same refractive index as a 36.5ppt solution of brine and so when using a brine/salt refractometer the salinity is likely to be low by 1.5ppt. This can be allowed for by the aquarist but only if they are aware of the difference.
 
After extensive development, D-D’s new refractometer addresses this issue, giving true salinity results when correctly calibrated and greater accuracy than previously attainable.

Features: 
 
True calibration for Seawater measurement. 

A New finer scale running from 20-40ppt salinity (SG 1.015 - 1.030) 

20/20 calibration at room temperature for more consistency and accuracy in everyday use. 

Full ATC (auto temperature compensation) ranging from 5 to 30 deg C

Review :: D and D Portable Refractometer
Submited By: Naweed Mahboob,  December 25, 2015, 7:38 pm
Collected By Charterhouse Aquatics
  A very reliable and robust refractometer I have used for many years very well priced too.  
Review :: D and D Portable Refractometer
Submited By: David Grant,  September 9, 2014, 10:17 am
Collected By Charterhouse Aquatics
  Great product, very accurate and beats hydrometer hands down. Superb turnaround service from Charterhouse.  
Review :: D and D Portable Refractometer
Submited By: Nicholas Hillery,  January 2, 2014, 7:57 pm
Collected By Charterhouse Aquatics
  fantastic bit of kit. easy to calibrate and easy to use, and super accurate.  
Review :: D and D Portable Refractometer
Submited By: darryl long,  November 29, 2013, 9:40 am
Collected By Charterhouse Aquatics
  Must have bit of kit. Very accurate and good piece of mind to know your SG level is right.  
Review :: D and D Portable Refractometer
Submited By: Rob Owens,  September 6, 2013, 10:35 am
Collected By Charterhouse Aquatics
  Solid And well made, great case and accessories - best refractometer in my opinion  
Review :: D and D Portable Refractometer
Submited By: Alder Field,  August 19, 2013, 8:10 am
Collected By Charterhouse Aquatics
  Excellent tool I would buy some calibration flluid as well  
Review :: D and D Portable Refractometer
Submited By: Andrew Collett,  February 19, 2013, 11:58 pm
Collected By Charterhouse Aquatics
  Got as a replacement for my old d-d unit, and was very happy with my new refractometer which i believe is an essential piece of kit.  
Review :: D and D Portable Refractometer
Submited By: Karl Prince,  December 27, 2012, 2:00 pm
Collected By Charterhouse Aquatics
  Great bit of kit. I would say a must have for any reefer. It you do buy one calibrate before you use it with a bit RO water or the correct calibrate solution as was well out when I got it  
Review :: D and D Portable Refractometer
Submited By: Steve Rosario,  November 20, 2012, 11:00 pm
Collected By Charterhouse Aquatics
  Great item. Easy to use and calibrate. Tools supplied for both. Comes in a handy case to keep it protected. Well worth it.  
Review :: D and D Portable Refractometer
Submited By: Calum Aird,  April 21, 2012, 6:01 pm
Collected By Charterhouse Aquatics
  Excellent refractometer, clear and processes readings. The only criticism I have is that I would have been better if the scale went from 1.000 to 1.030, rather than the current 1.015 to 1.030. This is because if you are doing a hypo salinity to your tank it makes it harder than it should be to work out the salinity level.  
Review :: D and D Portable Refractometer
Submited By: Jon Wayth,  January 13, 2012, 5:16 pm
Collected By Charterhouse Aquatics
  One of the best things I have spent my money on, gives me true reading every-time. I would never go back to a Hydrometer. The scale on the DD refractometer is both easy to read and clear, a A star product  

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