"mass spectrometer" meaning in English

{
  "forms": [
    {
      "form": "mass spectrometers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mass spectrometer (plural mass spectrometers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Measuring instruments",
          "orig": "en:Measuring instruments",
          "parents": [
            "Tools",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
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          "source": "w"
        }
      ],
      "glosses": [
        "A device used in mass spectrometry to discover the mass spectrum of a given substance."
      ],
      "id": "en-mass_spectrometer-en-noun-jMRJcXyM",
      "links": [
        [
          "device",
          "device"
        ],
        [
          "mass spectrometry",
          "mass spectrometry"
        ],
        [
          "mass spectrum",
          "mass spectrum"
        ]
      ]
    }
  ],
  "word": "mass spectrometer"
}

{
  "forms": [
    {
      "form": "mass spectrometers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mass spectrometer (plural mass spectrometers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
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        "en:Measuring instruments",
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      ],
      "glosses": [
        "A device used in mass spectrometry to discover the mass spectrum of a given substance."
      ],
      "links": [
        [
          "device",
          "device"
        ],
        [
          "mass spectrometry",
          "mass spectrometry"
        ],
        [
          "mass spectrum",
          "mass spectrum"
        ]
      ]
    }
  ],
  "word": "mass spectrometer"
}