EMF-Friendly Printing

Last month, I purchased the Brother HL-L2400DW Laser Printer for just $159 (AUD), and it turned out to be a fantastic find for those concerned about EMF exposure. Unlike almost all other printers, this one has a functional Wi-Fi on/off button, allowing users to disable wireless signals completely when not needed.

Even better, when I connect my ungrounded MacBook to a power outlet while using this printer, the MacBook becomes grounded, significantly reducing dirty electricity and electric fields. This means electric field readings drop from 30 V/m to 1 V/m in a potential-free measurement and from 300+ V/m down to 10-15 V/m with body potential. "For those working with plugged-in MacBook Pro's made after 2016, grounding is essential." (When used plugged in.)

Apple removed the grounded power adapter because, in some cases, it damaged the MacBook’s electronics when used in unbalanced setups — for example, connecting a grounded monitor to a MacBook while it was plugged in, with the monitor running on a different circuit.

Avoiding Ground Loops for Cleaner EMF Levels

One crucial thing to remember when using a grounded printer or monitor with a MacBook is to avoid having multiple grounded devices plugged into the same MacBook. This is where ground loops can occur, causing high electric field levels due to looping currents. People using grounded ethernet cable kits often unknowingly create ground loops, as they may not be aware of how electronic grounding works.

To prevent ground loops, it’s essential to ensure that only one grounded connection is used, whether it’s the printer, monitor, or a properly configured grounding kit. Many people don’t actually need a separate grounding kit, as most offices already have three potential grounding sources: a printer, a grounded ethernet switch, or a grounded monitor.

How to Check If Your Devices Are Grounded

Wondering if your device is grounded? It’s simple:

• Two-prong plug = Not grounded

• Three-prong plug = Grounded

If you're unsure, you can verify grounding using a low-frequency electric field EMF meter. The Mito Meter can be used in LFE mode to check your office setup and ensure proper grounding for minimal EMF exposure. Additionally, these meters can also check Wi-Fi/5G radiation levels.

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