The EFD159-D28 is part of the Teledyne E-Field Detector (EFD) series of products and is designed for precision measurements of electrical fields in harsh environments. It is a small, ruggedized device that is waterproof and dustproof, making it suitable for extreme environments such as military, industrial, and aerospace applications. The EFD159-D28 operates in a wide range of frequencies, with an accuracy of +/- 5 to 30 dB and a dynamic range over a -80to +70dB range (depending on configuration). The unit is powered by an internal rechargeable battery and can record up to 40 hours of data. It is also integrated with both USB and RS-232 interfaces for easy connection to computers and other devices.