"Penning gauge" meaning in English

{
  "etymology_text": "Named after its inventor, Frans Michel Penning (1894–1953), Dutch physicist.",
  "forms": [
    {
      "form": "Penning gauges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Penning gauge (plural Penning gauges)",
      "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",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
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      ],
      "glosses": [
        "A kind of cold-cathode ionization gauge."
      ],
      "id": "en-Penning_gauge-en-noun-t5ZVp1xL",
      "links": [
        [
          "ionization",
          "ionization"
        ],
        [
          "gauge",
          "gauge"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "US"
          ],
          "word": "Penning gage"
        }
      ],
      "wikipedia": [
        "Frans Michel Penning"
      ]
    }
  ],
  "word": "Penning gauge"
}

{
  "etymology_text": "Named after its inventor, Frans Michel Penning (1894–1953), Dutch physicist.",
  "forms": [
    {
      "form": "Penning gauges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Penning gauge (plural Penning gauges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "A kind of cold-cathode ionization gauge."
      ],
      "links": [
        [
          "ionization",
          "ionization"
        ],
        [
          "gauge",
          "gauge"
        ]
      ],
      "wikipedia": [
        "Frans Michel Penning"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "US"
      ],
      "word": "Penning gage"
    }
  ],
  "word": "Penning gauge"
}