The Home Office EMF Audit: What to Check Around Your Laptop, Monitors and Chargers

October 20, 2026

Here is the direct answer: the audit is a decision about your work position, not a hunt for the scariest number. You are deciding what to move or change around the chair, and the way to decide is to inventory the equipment, measure the actual seated position under a few documented conditions, and change one thing at a time. What follows is a repeatable walkthrough you can run in an afternoon, with the worksheet included, and it ends with the changes you can verify instead of assume.

The Real Decision

Start with the decision the audit exists to serve: what should move, and what should stay, around the place where you sit for hours? The inventory that feeds it is the equipment in and around the work position:

• The laptop, with its radios and its charging state
• The displays, and their power adapters, which are the unglamorous current-drawers of the desk
• The dock, if you use one, with everything it feeds
• The adapters and the UPS, the switching power supplies that live under or behind the desk
• The wireless peripherals, keyboard, mouse, headset, each a small radio
• The charging pad and the phone, wherever they sit
• The router, and the phone’s cellular radio when it is not on Wi-Fi

The discipline here is to identify the candidates without guessing which one dominates. A desk full of equipment produces a field that is a sum, and the sum is not knowable from the equipment list. That is what the measurement is for. For the network side of the inventory, including how the router fits into the picture, see our router vs. mesh comparison, and for reading whatever numbers come back, our guide to high meter readings.

Map the Points

The audit measures where a person actually is, not where the equipment is. Three points, all at the real work position:

• Head height at the chair. Where you spend eight hours, at the height of your head and torso.
• The desk surface. Where your hands and forearms rest, the closest occupied point to the adapters and the laptop.
• The footwell. The point people forget, and the one nearest the under-desk hardware: the UPS, the adapter cluster, and the dock all tend to live under the desk, and the legs are where the occupant is closest to them.

One note on the footwell and the desk point: these are the positions where a repositioning trial makes the most sense, because the hardware that produces their fields is usually movable. The head-height point is where you spend the time, and it is the point the whole audit ultimately serves, but the under-desk points are where the levers are.

Keep the field types separate as you go, because they come from different equipment and need different instruments. Radiofrequency (RF) energy, in V/m or power density (mW/m²), comes from the active radios: Wi-Fi, Bluetooth, cellular. Power-frequency magnetic fields, in µT or mG, come from current in the power hardware, the adapters, the dock, the UPS. Switching-related noise, if you have a suitable instrument for it, rides on the wiring and is a third quantity. The U.S. National Institute of Environmental Health Sciences’ guide to electric power EMF is the plain-language reference for the power-frequency side. And take the background first, with the equipment off or unplugged, so every condition has its own reference and a source under test is never confused with the room it sits in.

The Repeatable Worksheet

Four conditions, one at a time, at the same three points, in the same meter mode, over the same duration. Change one condition per comparison, preserve the connections you need, verify the radio states, and log what is happening: cellular versus Wi-Fi, Bluetooth on or off, the traffic running, and the equipment loads.

Condition	What changes	What to log
Laptop on battery, unplugged	The adapter is out of the circuit; radios as verified	Radio states; the task running; time window
Laptop charging	The adapter comes online	Adapter location; radio states; the task running
Dock and displays active	The dock and the display adapters draw current	What the dock is feeding; adapter locations
Matched wired vs. Wi-Fi workload	The network path, with the same task on both runs	Radio states on each run; the matched task; traffic

Three rules hold for the whole worksheet. First, no live electrical work: the conditions are created by plugging and unplugging at the outlet, with the equipment in its normal configuration, and anything that would require opening a panel or touching live wiring is out of scope for a self-run audit. Second, keep the time of day consistent across the comparison, because the room’s own background follows the household load, and a morning background is not an evening background. Third, the rows are blank until you fill them: this is a protocol, and the numbers in your home are the only numbers this post will ever contain. If you do not have a suitable instrument for one field type, record the condition and leave the row marked as not measured, rather than guessing.

Adapter and UPS Repositioning Trials

The most common change a desk audit supports is a repositioning: move the adapter, move the UPS, move the router. Run it as a trial, not a hope. The constraints that make a trial legitimate are the same constraints that make a desk a desk: the equipment keeps its ventilation, the cables keep their safe routing, and the ergonomics you worked for are preserved. A UPS that needs clearance to breathe is not moved into a closed cabinet to improve a reading.

The trial records the same positions, the same modes, the same units, and the same durations before and after the move, so the comparison is the move and nothing else. And the interpretation stays in its lane: the trial tells you what the move did to the field at the occupied points. It does not claim a specific reduction, because the size of the change is your measurement, and it does not claim a performance benefit, because a repositioning trial is not a study of health outcomes. If a move does not help at the points that matter, or cannot be made without breaking the constraints, the honest answer is that the layout stays, and the record says so.

The Short Checklist

1. Inventory the equipment in and around the work position.
2. Fix the three occupied points, and photograph them.
3. Take the background with the equipment off or unplugged.
4. Run the four conditions, one at a time, with the radio states and loads logged.
5. Make one change, re-run the same points, and record the difference.
6. Decide with the occupied-point numbers, and keep the record.