{
  "id": "meters:data-logger",
  "collection": "meters",
  "slug": "data-logger",
  "name": "Logging EMF instrument",
  "summary": "Any of the above with unattended recording: required whenever the assessment depends on an average, a night-time value or a 95th percentile rather than a spot reading.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "EMF logger",
      "24 hour logging meter"
    ],
    "measures": [
      "magnetic-flux-density",
      "power-density",
      "electric-field-strength"
    ],
    "bandCovered": {
      "minHz": 30,
      "maxHz": 8000000000,
      "label": "instrument dependent"
    },
    "priceBandUsd": [
      200,
      3000
    ],
    "detects": [
      "Diurnal variation in power-line loading",
      "Night-time smart-meter and mesh traffic",
      "Intermittent sources that a spot survey misses entirely"
    ],
    "cannotDetect": [
      "Anything outside the host instrument's band"
    ],
    "buyingCriteria": [
      "Sample interval fast enough for pulsed sources, with peak capture per interval",
      "Exportable raw data, not just a summary screenshot",
      "Battery life covering the full logging window"
    ],
    "related": [
      "protocols:elf-magnetic-survey",
      "emitters:transmission-line"
    ]
  },
  "sources": [
    {
      "id": "sbm-2024",
      "title": "Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)",
      "publisher": "Institut für Baubiologie + Nachhaltigkeit (IBN)",
      "url": "https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf",
      "year": 2024,
      "kind": "ngo",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/meters/data-logger",
    "html": "https://emfbase.com/meters/data-logger",
    "markdown": "https://emfbase.com/meters/data-logger.md",
    "collection": "https://emfbase.com/api/meters"
  }
}