Either show „density” OR „specific/relative Density“ ! Most devices available in Europe show „density“, whereas devices from USA mostly show „specific/relative density“.
Nearly always show „specific/relative Density“.
Indications for devices showing “density” :
Indications for devices showing “specific/relative density”:
Measurement value is relative to water at 25°C / 77°F, which has a density of 0.997. Value displayed is density divided by 0.997 and thus higher than the „normal density “ Tip: Related temperature can also be different to 25°C/77°F. In this case you have a calibration different to 25°C/77°F
change your Aqua-Calculators preferences accordingly!
In case you are still unsure about your device, contact the manufacturer!
Refractometers: They measure „salinity“ but nearly always also show also the “relative density” on a second scale. Recommendation: Use salinity scale only!