5 different salanity tests 4 different readings?

[redtang]

I have tested my salanity on my 125 gal. FOWLR 5 different times with 5 different testers, and 2 different LFS. I am getting on my aquarium systems tester 1.021, and on my coralife deep six 1.025. 1st LFS aquarium system tester 1.022, than defferent aquarium system tester 1.022. Took the water that was left to 2nd LFS 1st test aquarium system tester 1.025, 2nd test same tester 1.024. What should I go by?

 

[bang guy]

If you want an accurate number you'll need a refractometer.
You can still use your hydrometer, just check it against a refractometer every fer months and note the difference.

 

[20galsw]

Hi, I assume you have seasoned the needles in your hydrometers, and your LFS's have done the same? Air bubbles on the needle and crystalized salt(if you don't rinse them after every use) can also cause inaccurate readings. Temperature changes can also account for different readings. Mine will fluctuate by about .003 if there are air bubbles on the needle.
I use a Coralife Deep Six myself, and it has always been pretty consistent.
I would say that the deep six would be more accurate. If salinity is that important to you, I would agree with the above reply, and suggest you either invest in a refractometer, or have it tested with one occasionally.
Thanks,
-David-

 

[beth]

Swing arm hydrometers are worthless IMO. Use a quality glass hydrometer, or a refractormeter.