FRIENDLY REMINDER!!!

[Tangwich]

If you're testing your salinity with the Hanna salinity and temperature test pen shown below, they must be calibrated often for reliable results. It had been a couple weeks since I calibrated mine and I noticed that some of my mushrooms were detaching. Double checked salinity with refractometer and Milwaukee digital refractometer and my tanks were all at 1.028. Hope the PSA helps someone.

 

[Roie]

I haven't tested mine in months, but my hammer did pass recently... thanks for the heads up!

 

[Bighauck]

I have heard this from a few people lately
What do you guy recommend for best refractometer

 

[joseserrano]

Hanna recommends once a month i typically do this on the first of the month.

 

[Dorado]

I have heard this from a few people lately
What do you guy recommend for best refractometer

It’s not a refractometer, but I use the tropic Marin hydrometer. Very consistent and doesn’t need to be calibrated. I haven’t looked back

 

[Tommy Ngo]

I have heard this from a few people lately
What do you guy recommend for best refractometer

Vee Gee STX-3
You can get it on Amazon.

 

[Smite]

Same as Dorado for me. I switched from the Hannah pen after getting some high ICP test results back while the pen was reading 1.025 calibrated. I went Tropic Marin hydrometer based of Ali at Amazing Reef and Aquariums advice. It shows pretty close to ATI ICP results. Pair it with a plastic 500ml graduated cylinder off amazon, like $10. Pull 450ml of water from the display with the cylinder, drop in the hydrometer float. A very simple and consistent test.

 

[mrdanielface]

Fyi, trident calibration fluid is 1.025. Although it's not confirmed, this thread shows that some people have been testing bottles and have came up with the same salinity. Might be useful to cross check your refractors and hannas
https://www.reef2reef.com/threads/trident-calibration-solution.801879/

 

[OGFrenchHorn]

The best hydrometer I’ve ever used was the instant ocean one. I never had to calibrate it and it killed all my corals.


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[BluRocket3]

Also make sure to rinse the hanna pen with RODI water after testing your salinity. Most people don't do this

 

[Tangwich]

Also make sure to rinse the hanna pen with RODI water after testing your salinity. Most people don't do this

That's a great point Kyle..I can honestly say I don't rinse the pen after use.