you know you can't add another decimal there. the swing arm measures 1.023. If you wanted to extrapulate I would say your arrow looks more like 1.0236. at any rate your accuracy is only as good as your smallest measured value. so your swing arm has a accuracy of +/- 0.001
as with anything some are better than others, I got a refractometer from a fiah store and it reads 3 decimal places like the ones here, I picked one up some where else, paid a bit more money for it and it reads 4 decimal places.
One note about floating glass type, the reading changes with changes in barometric pressure, and 3 different people will get 3 different readings off them due to the water meniscus and the angle they look at it. Oh and the break easy
. I use them for making wine only, my tank gets the refractometer (well the wine might also as soon as a find a decient one that is cheep.
)
Steve
Quote:
Originally Posted by mike31154
+1 on the consistency. I usually double/triple check to ensure my water change salinity is as close as possible to the display water.
Here are some photos of my measurements with the different 'instruments'.
IO Swing Arm 1.0234
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