PowerGrid Monitoring

LFM-X Mode Overview

The LFM-X Extended Mode takes the guesswork out of assessing background magnetic fields from the PowerGrid — a crucial step for anyone living in built-up areas. These dynamic 50/60 Hz magnetic fields can’t be mitigated without relocating the powerlines themselves, making it vital to understand your environment before committing to a property.

With LFM-X Mode, you don’t need a PC or connected device for recording or playback. Simply set it up and let it record both the average and peak A/C 50/60 Hz magnetic field levels over a twelve-hour logging session. Once complete, the results are clearly displayed on the Mito Meter’s intuitive LED light display — giving you reliable, real-world data at a glance.

Instructions

To activate LFM-X Mode, follow these steps and make sure you have a fully charged battery before logging the twelve-hour event. (Only takes one hour to charge battery from flat.)

1. Turn on the meter and select RF.
   

2. Quickly move the MODE switch down to LFE Mode and back to RF Mode twice, within two seconds. (RF-LFE-RF-LFE-RF) Two lights will start to blink, one orange, one red. If no lights flashed, you were not quick enough, try again.
   

3. Then move the mode switch down one click to LFM Mode. (RF-LFM) Now you will see the LED lights sweeping left to right, which will continue for 20 seconds, giving you time to position the meter in an upright position. (USB Socket facing down.)
   

   Once the LFM-X Mode is activated, do not move, bump, or touch the meter for twelve hours. It is advisable to maintain a distance of at least one meter from the meter, as the magnetic sensor is highly sensitive to any touch or movement.

   
   

4. After twelve hours, the average and highest recorded A/C 50/60 Hz RMS magnetic field values from the PowerGrid are displayed.

   If no lights appear, it means no measurable values were recorded — indicating that no magnetic fields were detected above 10 nT (0.1 mG).

   
   

   For reference, Building Biology’s recommended limit for sleeping areas is 20 nT (0.2 mG) — a level that can be challenging to achieve in today’s highly electrified environments. Note you have up to 24 hours of battery life on LFM-X Mode, so will need to check the results before the meter battery runs flat.

Placement & Position

The meter should be mounted at a 90-degree angle, at least two meters away from electronics, appliances, or electrical cables.

LFM-X Notes

The meter must be square/upright for the most accurate result and away from another magnetic fields.   A 90-degree angle/up-right position, will not work if you are under or overpower distribution/transmission lines. (Not usually the case.) If this is the case, find the angle/axis on the meter in LFM Mode first with the highest reading and mount the meter in that axis/position for the twelve-hour logging session. Ideally, you do not want to live or work in anything over 200nT(2mG). Pregnant mothers and children should not be exposed to long term exposures of more than 1mG/100nT. Sleeping areas should be kept below 0.2mG/20nT.

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EnvroSens Software

Optional EnvroSens monitoring software can be used for more in-depth analytics. (Compatible with Apple, Android & Windows.) When using the EnvroSens software, the LFM Mode magnetic field sensitivity is extended down to more than 5 nanoTeslas (0.05 mG) and has a frequency counter.