Beskrivning: Hydrometer eller areometer i träfodral klätt med sämskskinn. Innehåller en sluten rörformad behållare, nertill med uppsvälld del med små blykulor (glaset är idag sönder). Blykulorna fungerar som sänke och längs röret finns en skala på papper. Beroende på vätskans densitet sjunker hydrometern ner till ett visst djup och man kan läsa av skalan.
På fodralet skrivet med bläck: "Areometer eller luftprofvare".
Gåva av disponent Nils Ramström (1866-1934), mellan 1898 - 1922 boende på Rosenhill, Nyköping. Född på Väsby i Svärta socken.
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