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Flow cups with fixed nozzle
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer
Hydrometers according to Baumé, without thermometer