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The ELF PF4 power-frequency meter

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EMFields ELF PF4

ELF PF4 meter

The ELF PF4 has been replaced by the PF5 meter (purchase only) which also measures magnetic fields from induction hobs, and fields from CFL lightbulbs. You can still hire the ELF PF4 from EMFields by calling us on the above number during our office hours (hire stock is kept separately from sales stock).

The ELF PF4 replaced the EMFields PRO meter, and measures Electromagnetic Fields (EMFs) produced near powerlines, substations or transformers, house wiring and electrical appliances.

It will be able to help you check if you and your family are exposed to levels of EMF that are too high, at home, at school and at work.

It measures up to 20 microtesla and 2000 volts per metre. The UK average residential magnetic field is about 0.05 microtesla. Ideally electric fields should be 10 volts per metre or less.

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Further Information

Technical specifications

  • Easy to operate, easy-to-read display
  • Measurement range: 10 - 2000 Hz ±3 dB
  • Electric sensitivity: 0 - 1999 V/m
  • Magnetic sensitivity: 0 - 19.99 μT
  • Resolution: 1 V/m (E) and 0.01 μT (M)
  • Accuracy: ±2% overall, ±3 digits at 50 / 60 Hz
  • Power source: 9v PP3 battery
  • Power draw: 6 mA
  • Battery life: typically 75 hours
  • Size (mm): 190 x 104 x 33 (LWD)
  • Weight: 258g (305g with battery)
  • Download specifications document » Download specifications document (180 KB)
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The EMFields ELF has a digital readout and measures electric and magnetic fields with frequencies from 10 to 2000 Hz (±3 dB). The magnetic scale has a resolution of 0.01 microtesla (10 nanotesla) and a full scale of 19.99 microtesla. The electric scale has a resolution of 1 volt/metre and a full scale of 1999 V/m (with accuracy of ±2% ±3 digits at 50/60 Hz).

This is the meter to use for EMFs from electric power sources - overhead lines, substations, underground cables, house wiring, electrical appliances and equipment, etc. You can use it to measure the electromagnetic fields (EMFs) at home and in the workplace. It is hand-held and with it you can measure the fields at any time of the day or night. The hire meters are sent out with full instructions by Royal Mail 1st class recorded delivery. If you need to take readings urgently, perhaps there is little time before a decision about buying a property needs to be made, you can request our priority post service which means the meter is sent Special Delivery. If you place the order before 11.00 a.m, it will usually be sent the same day, and you should receive it the following day. Both Recorded and Special Deliveries are signed-for services. We can send the meter to your work address if this is more convenient for you.

At work you may be exposed to quite high levels of fields. In the office environment, there are computers, VDUs, cabling, faxes, photocopiers, printers, fans, table lamps, scanners and fluorescent lighting. Fluorescent lighting can generate very high levels of electromagnetic fields, and have been found to be responsible for occupational ill-health, frequent work absence, and for initiating electrical sensitivity, a seriously debilitating condition.

Power consumption, and the associated electromagnetic field levels, varies over time in a house. The peak periods of power demand on the circuit are likely to be between 8.00 a.m. and 9.30 a.m. and between 4.30 p.m. and 6.30 p.m. depending on the area where you live. There may be a period of high demand between 12 midnight - 8.00 a.m. if there are many people in your neighbourhood who use night storage heaters. In cold weather, field levels can be up to three times higher than in periods of warmer weather, because of the greater use of electric heating and cooking. If your power supply circuit serves shops, schools, or industry, especially if these include long days or opening times, or overnight working, it may significantly change power demand and field levels both inside and outside the house.

The fields in your garden may vary due to the presence of overhead or underground cables, substations or transformers.

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