Boltek EFM-100 Atmospheric Electric Field Monitor 120V/100ft with Software

Boltek EFM-100-120V-100FT

Manufacturer Part#  EFM-100-120V-100FT

Provantage Code:  BOLT00E

Condition:  Factory New

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ElectronicsWeather / EnvironmentalWeather Accessories


Boltek EFM-100-120V-100FT Specifications

    EFM-100 Atmospheric Electric Field Monitor 120V/100ft with Software


    EFM-100 Atmospheric Electric Field Monitor - Electric Field Mill with Monitoring Software for Windows

    Measuring the static electric field generated by thunder clouds, the Boltek EFM-100 not only detects nearby lightning but can detect the atmospheric conditions which precede lightning. Electric field data is displayed & graphed on your desktop computer using the included software.

    For complete electrical isolation from the field mill outside, the EFM-100 connects to your Windows computer using fiber optic cable.

    Features aluminum & stainless steel construction for corrosion resistance, gold-plated connectors throughout, & the highest quality ball-bearing brushless DC motor for excellent reliability.


    • Detect lightning up to 30 miles away.
    • Detect the conditions which precede lightning.
    • Monitor the electric charge above and near your location.
    • Monitor up to four separate locations on your PC.
    • Watch trends develop.
    • Attention-getting alarms.
    • Review archived data from previous storms.
    • Stay current w/free software updates from Boltek website.

    Electric fields develop wherever there is a difference in electric potential. If the electric field gets high enough you can feel your hair stand on end (if this happens outdoors during a thunderstorm crouch down with your feet together as you are about to be struck by lightning.) An electric field is what attracts your hair to a charged comb or a charged balloon.

    The electric charge contained in a thunder cloud also generates an electric field. This field can be measured on the ground.

    Electric field is measured in Volts per meter (3.3 feet.) the electric fields which accompany thunderstorms normally measure in the thousands of Volts per meter, usually abbreviated to kV/m.

    Lightning can be detected as a sudden change in the electric field.

    The EFM-100 software has three built-in alarms: High Field, Very High Field, and a Lightning alarm. Both the High Field & Very High Field alarms activate if the electric field magnitude rises above a preset level (user configurable). For example: 1 kV/m for High Field alarm and 5 kV/m for the Very High Field alarm.

    The display turns red when the Very High Field alarm is active.

    The software plays a user selectable WAV file when an alarm activates; WAV file messages will repeat at a predefined frequency (user-configurable)

    The display turns yellow when the High Field Alarm is active. Once the field returns to normal the display will return to green.

    The Lightning Alarm is activated if a sudden electric field change is detected.

    Up to four field mills can be monitored. The field mills can be connected to the computer directly (fiber optic cable to USB/RS232) or remotely over a network (either locally or via Internet). Electric field data can be logged to your hard drive for review at a later date.

    *** NOTE: The EFM-100 is intended for meteorological & scientific applications. While it can provide valuable weather data, it is NOT intended nor recommended as a lightning safety warning device. ***

    Optional Tripod is available & is not included


    U.S. 120-VOLT


    • EFM-100 Electric Field Mill
    • 100 feet (30m) Power Cable
    • 100 feet (30m) Fiber Optic data cable
    • 120VAC Power Supply
    • EFA-10 Fiber Optic Receiver
    • USB Cable
    • RS232 Cable
    • EPM-1 Power Module
    • Windows Software CD
    • User Manual


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Boltek EFM-100-120V-100FT