"currency detector" meaning in English

{
  "forms": [
    {
      "form": "currency detectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "currency detector (plural currency detectors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w"
        },
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        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [],
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          "kind": "other",
          "name": "Pages with 1 entry",
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        {
          "kind": "other",
          "name": "Terms with Mandarin translations",
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        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Machines",
          "orig": "en:Machines",
          "parents": [],
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        }
      ],
      "glosses": [
        "A device that determines whether notes or coins are genuine or counterfeit."
      ],
      "id": "en-currency_detector-en-noun-oclUYvNJ",
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "lang_code": "cmn",
          "roman": "yànchāojī",
          "sense": "counterfeit detector",
          "word": "驗鈔機 /验钞机"
        }
      ]
    }
  ],
  "word": "currency detector"
}

{
  "forms": [
    {
      "form": "currency detectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "currency detector (plural currency detectors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Mandarin terms with redundant transliterations",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Mandarin translations",
        "en:Machines"
      ],
      "glosses": [
        "A device that determines whether notes or coins are genuine or counterfeit."
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "lang_code": "cmn",
      "roman": "yànchāojī",
      "sense": "counterfeit detector",
      "word": "驗鈔機 /验钞机"
    }
  ],
  "word": "currency detector"
}