High accuracy short range lightning detection from 0 to 24 miles (0 to 38km) with the capability to receive lightning alerts on your cell phone or email while out in the field.

• High accuracy lightning detection (0 to 24 miles / 0 to 38km)
• Customizable alarm distances and electric field levels
• Monitors and alerts for weather conditions that precede lightning
• SMS text messaging and E-mail alarm notifications
• Electrical isolation from the field mill to PC or Laptop
• Monitor up to four separate locations per computer
• Inverted Mounting Kit greatly reduces the number of false alarms during heavy precipitation
• Standard RS485 data output with optional fiber optic package
• Aluminum and stainless steel parts throughout for corrosion resistance
• One year parts & labor manufacturers warranty
• Free software updates

Included EFA-21 doubles as a Power Module and RS485-USB Adapter that allows you to provide power and connect
an EFM-100 Atmospheric Electric Field Mill directly to your computer's USB port using a single device.