Definitions

from The Century Dictionary.

  • noun A scale of tints with which ozonic test-papers are compared in order to determine the relative amount of ozone in the air.

from the GNU version of the Collaborative International Dictionary of English.

  • noun An instrument for ascertaining the amount of ozone in the atmosphere, or in any gaseous mixture.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An instrument for measuring how much ozone is present in a mixture of gases.

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