NJS or non-NJS? There's a difference but you can only tell when you've filled the bathtub.
and it can't be freshwater, it needs to match the salinity of the water in the sea nearest to the place of the chains manufacture, or you'll get an incorrect reading.
and it can't be freshwater, it needs to match the salinity of the water in the sea nearest to the place of the chains manufacture, or you'll get an incorrect reading.