"contact level" meaning in English

{
  "forms": [
    {
      "form": "contact levels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "contact level (plural contact levels)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A delicate level pivoted so as to tilt when two parts of a measuring apparatus come into contact with each other; used in precise determinations of lengths and in the accurate graduation of instruments."
      ],
      "id": "en-contact_level-en-noun-AWwQ7Nh1",
      "links": [
        [
          "level",
          "level"
        ],
        [
          "pivot",
          "pivot"
        ],
        [
          "tilt",
          "tilt"
        ]
      ]
    }
  ],
  "word": "contact level"
}

{
  "forms": [
    {
      "form": "contact levels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "contact level (plural contact levels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A delicate level pivoted so as to tilt when two parts of a measuring apparatus come into contact with each other; used in precise determinations of lengths and in the accurate graduation of instruments."
      ],
      "links": [
        [
          "level",
          "level"
        ],
        [
          "pivot",
          "pivot"
        ],
        [
          "tilt",
          "tilt"
        ]
      ]
    }
  ],
  "word": "contact level"
}