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To use a floating glass hydrometer correctly, you should place the water to be checked into a glass cylinder (e.g. a measuring cylinder). This allows you to check it accurately. You can take readings in the tank, but visibility can be a problem as will water movement.
Lab grade floating glass hydrometers are available from most lab suppliers. You can probably find a few in the 'phone book. They may also sell refractometers.
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ATJ
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