A. This electromagnetic field (EMF) tester can be used to measure electric field strength, radiation power, magnetic field strength, and static magnetic field polarity. The effective measurement range is from 50MHz to 3.5GHz. It is equipped with built - in magnetic field and electric field sensors, which can provide data for electric field (EF), radio frequency (RF), and magnetic field (MF) testing. The protection level of this electromagnetic radiation detector is IP3X, making it durable. B. This rechargeable electromagnetic field device is equipped with a 2.0 - inch TFT color screen and graphical display, which is convenient and intuitive to use. It has sound and flash alarm functions, and the alarm threshold is adjustable. It also provides waveform display modes for electric and magnetic fields and can standby for 16 hours. C. It can detect radio frequency and measure the electromagnetic radiation of household appliances, and is suitable for office workers, pregnant women, and the elderly. It can be used to detect magnetic and electric fields from sources such as mobile phone signal towers and low - frequency devices to limit exposure to potentially harmful radiation. D. Color: White E. Material: Plastic F. Package contents: 1 electromagnetic field tester G. Only the above package contents are included, and no other products are included. H. Note: Light reflection and different displays may cause slight differences between the color of the items in the picture and the actual product. The allowable measurement error is ±1 - 3 cm.