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In Beck's hydrometer the zero of the scale corresponds to density 1 000 and the division 30 to density.
If you have a battery hydrometer, the reading should be between 1.28 and 1.30.
The more reliable narrow spectrum hydrometer gave a reading of 1.026 which actually would mean a saline figure of 35.
The use of Sikes's hydrometer necessitates the employment of a considerable quantity of spirit.
The specific gravity of each batch in the stock solution should be checked at least weekly by designated staff with a calibrated hydrometer.