Hanna Salinity Tester Review

Salinity is hands down the most important parameter we test for in a saltwater aquariums, but salinity, and how it is measured, is quite poorly understood. The Hanna Salinity Tester is a new measurement device which is both affordable and…

Hanna Seawater Refractometer is the Ultimate Way to measure Salinity

I started keeping saltwater tanks in 1996 and since then have used many different tools and instruments to measure salinity. At first it was with floating glass hydrometers, and soon thereafter it was swing arm hydrometers.  These two devices use the…

Get Your Salinity On Point With Brightwell Calibration Standard

For a saltwater tank, salinity is quite literally the most important measurement we can make, yet the entire hobby basically treats salinity as an afterthought. Since a proper salinity measurement can give you a basic overview of all of the elements…

Benefits to Using a Refractometer versus a Hydrometer

After temperature, Salinity is the most important measurement of seawater you can make for your tank.  Therefore, refractometers and hydrometers are the most used tool in the hobby, or at least they should be. Both hypersaline and hypo saline environments make unsuitable…

Salty Q&A: How Do You Make Small Salinity Adjustments?

Saltwater Smarts visitor Andrew had the following question about our post titled “5 Tips for Maintaining Stable Salinity in a Saltwater Tank.” Since we get similar questions quite frequently, we thought it might be helpful to elaborate on our response…

Master Refractometer hot rod salinity measurement from Atago Japan

The Master Refractometer series by Atago is a high performance line of salinity measuring tools from Japan. We recently got some hands-on time with the Atago Master-S/MillM refractometer at the Bali Aquarium water monitoring laboratory, and it was quite refreshing to see a…

AccuraSea salinity reference gives you no excuse not to calibrate refractometers

For a hobby that is founded on reproducing the needs of saltwater animals, reef and marine aquarists are woefully undereducated about what salinity actually is, and how to accurately measure it. So many problems with chemical and mineral imbalances in…

Two Little Fishies AccuraSea seawater reference and calibration solution

AccuraSea is a new product from Two Little Fishies which is probably the most expensive seawater you can buy — but this ain’t for doing water changes with. AccuraSea is a high accuracy solution of seawater that is made to…

We can only recommend Red Sea’s Refractometer for measuring aquarium salinity

A couple years ago we were really thrilled when D-D came out with the first ever aquarium refractometer that is calibrated for seawater salinity, a true aquarium salt measurement device that trumped all the salt-water refractometers that we were using…

Using the Dupla Marin hydrometer as a hardware salinity reference

The Dupla Marin high resolution Hydrometer came along at a time when we are really becoming quite critical about salinity measurement. This large, oversize hydrometer is specially designed to measure seawater salinity at 25C/77F but only between 33 and 38 parts…