
1) Densimeter 2) Densitometer 3) Laboratory glassware 4) Measuring instrument
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https://www.crosswordclues.com/clue/dasymeter

A dasymeter was meant initially as a device to demonstrate the buoyant effect of gases like air; as shown in the pictures on the right. A dasymeter which allows weighing acts as a densimeter used to measure the density of gases. ==Principle== ==Construction and Use== It consists of a thin sphere made of glass, ideally with an average density close...
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http://en.wikipedia.org/wiki/Dasymeter

• (n.) An instrument for testing the density of gases, consisting of a thin glass globe, which is weighed in the gas or gases, and then in an atmosphere of known density.
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http://thinkexist.com/dictionary/meaning/dasymeter/
Da·sym'e·ter noun [ Greek
dasy`s rough, thick +
-meter .]
(Physics) An instrument for testing the density of gases, consisting of a thin glass globe, which is weighed in the gas or gases, and then in an atmosphere of known density.
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http://www.encyclo.co.uk/webster/D/8

[
n] - densimeter consisting of a thin glass globe that is weighed in a gas to determine its density
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http://www.webdictionary.co.uk/definition.php?query=dasymeter

dasymeter An instrument for testing the density of gases, consisting of a thin glass globe, which is weighed in the gas, or gases, and then in an atmosphere of known density.
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http://www.wordinfo.info/words/index/info/view_unit/616/
noun densimeter consisting of a thin glass globe that is weighed in a gas to determine its density
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https://www.encyclo.co.uk/local/20974
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