Description The advantage of a magnetic field detector is its ability to measure the strength of magnetic field, which is essential in many applications. With reasonable design and high adaptability, this magnetic field detector can be well applied to identify devices that produce high levels of radiation, and it will be a good choice for you. Features -Color:As Shown-Material:ABS, electronic-Size:14.30X5.30X2.20cm/5.62X2.08X0.86in-Power supply: 1 X 9V battery (not included)-There are 5 LEDs, each representing a field strength range as follows:Dark Green - "normal" area - normal background magnetic field. 0 to 1.5 milliGaussGreen - "low" zone - low level magnetic field. 1.5 to 2.5 milliGaussYellow - "Warning" area - medium magnetic field. 2.5 to 10 milliGaussOrange - "high" zone - high magnetic field. 10 to 20 milliGaussRed - "Warning" zone - extremely high magnetic field. 20+ milliGauss- The emf meter ghost hunting tool helps measure electromagnetic fields to identify radiation.- The magnetic field detector is an electronic device that measures the strength of electromagnetic fields.- The emf meter enables users to determine the extent to which to limit exposure, both useful and practical for home use.- Magnetic field detector is a portable tool for detecting magnetic field that cannot be seen or touched, an essential tool for many industries.- The emf meter can be applied for testing TV, microwave oven, refrigerator, computer, cell towers, etc.Packing list: 1 x radiation detector1 x English manual