Extremely accurate and easy to use swing needle hydrometer.

Provides temperature corrected readings in water that is in the temperature range of 20-29 deg C

Ensure there are no air bubbles attached to the swing arm needle before taking the reading, and wash out with fresh clean water after use

Reads : Salinity (ppt) 0 - 40. : S.G. 1.000 - 1.032

Marine fish and corals require stable water conditions, which makes regular checking of salinity important. It’s also necessary to check salinity when making up new water for water changes.

The TetraTec Hydrometer makes it simple to accurately check the salt content of water, giving precise readings over a wide temperature range (20 – 29°C). It works by measuring the specific gravity (relative density) of the water, and converting this to salinity.

All you need to do is fill up the hydrometer with water, and read the value off the scale printed on the side. 


  £9.75

Easy Dip and Read Hydrometer with swing needle.Measures :

Salinity (ppt) 0 - 40 ppt (at 25 deg C)

Specific Gravity 1.000 - 1.030 (with optimum marine tropical range 1.020-1.023 highlighted) (at 25 deg C)

Rinse with fresh water after use as dried salt on swing needle may effect subsequent readings. 


  £7.99

* Easy accurate readings of temperature and salt levels.

* Green indicators show safe range of salt level and temperature for most salt water species. 


  £4.79

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  


  £39.95

The strong plastic carrying case contains the refractometer, a pipette for the water sample, a screw driver for calibration and full instructions.

Technical Data

specific density 1.000 – 1.070

salt concentration 0 – 100 °/°°

Accuracy 0,001 /1 °/°°

temperature compensation 10 – 30 °C

Temperature compensated Refractometer for the determination of the salinity

 


  £39.99