Profile: Boltek Corp. specializes in offering lighting detection systems. StormTracker works by detecting the radio signals produced by lightning. These are the same signals as on an AM radio during a thunderstorm. Its direction-finding antenna provides direction information while storm distance is calculated from received signal strength. The special processing in software reduces the effects of strike-to-strike energy variations providing more accurate distance information. EFM-100 atmospheric electric field monitor is a short-range lightning detector helpful in monitoring nearby thunderstorms. It also detects the high electric-field conditions which precede the first lightning strike.