• Jesse

Stephanie4990

Moreover, the floating hydrometer is highly dependent on the temperature of the water. Some are calibrated at 20°C, while Sera, for example, is calibrated at 25°C. The scale on the floating hydrometer, or rather the "hydrometer," indicates density. The hygrometer shows salinity. Both have inaccuracies and, as mentioned above, temperature calibrations. P.S. By the way, I didn't include the link to Sera; it appeared by itself.

Diana8604

I measure the density at a temperature of 25. The hydrometer has a thermometer, and there are also corrections for the fact that if the temperature changes by 1 degree, the density changes by a certain amount (I don't remember how much right now). P.S. I got the hydrometer from A, Igor said to keep it at 1.023. Tkach recommends raising it. How should I determine that?

Samuel6138

You once wrote that you use AON-2; I have the same one, but I can't understand what temperature it is calibrated for, as it's not mentioned in the passport (it's a general-purpose aerometer, I think).

Amy

Ray is a good aquarist! But I don't see the point in raising the salinity; in the sea, it fluctuates between 21 and 24.

Aaron

At 20 degrees Celsius. The difference from 25 degrees is about 1-1.5 divisions.

Noah1632

The standard salinity for a reef can be considered to correspond to a density of 1.024 at 25 degrees.