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The PF5 Pocket Power Frequencies Meter (ELF & VLF)

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PF5 uT
microtesla model
£150.00 (inc. vat)
In stock
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The PF5 Pocket Power Frequencies Meter (ELF & VLF)

The PF5 is our main power-frequencies detector. The PF5 measures electric and magnetic EMFs from house wiring, including those from appliances at home and at work. The PF5, unlike most EMF meters on the market, also measures frequencies in the range from 20 Hz to well over 50 kHz. This enables the PF5 to measure the higher frequency electric and magnetic fields emitted by induction cooking hobs, solar-panel inverters, 'energy-saving' compact fluorescent (CFL) lamps and some LED lights.

These are amongst the most concerning new sources of our electromagnetic field exposures as the currents they induce in your body are proportional to the frequency. So a magnetic field at 25000 Hz (25 kHz) will induce 500 times more current in your body compared with same strength of field at 50 Hz.

The PF5 is an easy to use, pocket sized, accurate, power-frequencies meter which is ideal for carrying around. It measures both electric and magnetic fields and is available labelled in either international microtesla (µT) units or in milliGauss (mG) units.

milliGauss model
£150.00 (inc. vat)
In stock
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The PF5 monitor - Further Information


Technical specifications

  • A line of coloured LEDS shows the level
  • Electric fields range: 5 - 200 V/m
  • Magnetic fields range: 0.02 - 2.0 µT
     » also available scaled 0.2 - 20 mG
  • The following applies to electric & magnetic fields
     » Resolution: 8 LEDs plus 7 middle points
     » Accuracy: 50 to 2000 Hz ±10%
     » Accuracy: 20 to 50000 Hz ±3 dB
     » with a useable response from 15 Hz - 70 kHz
  • Battery: PP3 9V Alkaline or Rechargeable
  • Current: 16-23 mA
  • Battery life: 25 hours (normal alkaline)
  • Low battery (6.7V) shown by red V/m LED
  • Size (mm): 110 x 63 x 21 (LxWxD)
  • Weight:140g incl.battery; 175g with pouch
      (the following files each open in a new window)
  • Download uT user notes » Download PF5 µT user notes (300 KB)
  • Download mG user notes » Download PF5 mG user notes (400 KB)
  • Download further information » Download PF5 further information (1 MB)

We designed the PF5 power-frequencies meter using our 25 years experience of EMF measurements and research. Although some specialist meters also measure VLF frequencies, they tend to be expensive. The PF5 is an affordable meter that makes it easy to measure these new major sources of EMF exposure.

Induction hobs use VLF magnetic fields to induce high currents in iron and steel pans which then internally heat the metal. They are very energy-efficient, but some of the VLF fields leak out around the base of the pan and expose the person doing the cooking. A 2012 study that measured 16 induction hob units found that most could exceed even the very high ICNIRP levels. Induction hobs can expose you to some of the highest exposures that most people will experience in their lives.

Not only can the PF5 measure those magnetic fields, but the PF5 can also measure VLF electric fields from other modern devices like energy saving CFL light bulbs. These electric fields can cause headaches and eye problems among other adverse health effects.

Most non-sine-wave solar power inverters generate high levels of VLF electric and magnetic fields that the PF5 can also measure while most power-frequency EMF meters will ignore them.

Note that a 0.4 µT (4 mG) magnetic field at 25 kHz will induce the same currents in your body tissues as a 200 µT (2000 mG) magnetic field at 50 Hz, so it is advisable to limit your exposure to these VLF fields.

inductionheating cooker-hobs light bulbs

Easy to use

Alert messageCarry pouch supplied

Our PF5 Pocket Power Frequencies Meter comes complete with a quality pouch, including neat folded user notes.

Press the button once to activate the PF5. It will measure the magnetic fields and the right-hand scale is indicated by a green LED.

Press the button again to change to measuring electric fields. Each short press will cause it to swap between electrical and magnetic measurements.

The internal electric field sensor antenna is inside the top end of the case. The large magnetic field coil is fairly central in the top half of the back of the instrument. Turn the PF5 for the highest reading.

We show electric field measurements, at face height when standing, of two different light bulbs - a 60 Watt incandescent bulb and an equivalent light-power 'energy-saving' compact fluorescent lamp (CFL). The electric fields are 3 times higher, but because of the much higher frequency the induced signals in your body will be in the order of 1500 times greater.

To turn it off, push and hold for about 2 seconds. It will also automatically switch itself off after about 5 minutes use to save the battery power.

The LED scales are easy to read and use and are colour-coded for reasonable precautionary use. When two LEDs are both lit next to each other, then the exposure level is halfway between the two.

Download further information » Download PF5 further information (1 MB)

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