Features Coloured LED Indicators: this EMF meter has 5 LED indicators to see the readings in daylight or darkness and is easy to carry around as it fits in your pocket or purse. Health Protection: This EMF meter is designed to prevent the potentially harmful effects of prolonged overexposure to electromagnetic fields. Accurate Measurement: This EMF meter runs on a single cell and reports EMF measurements in the 5 mGyS range. Large Frequency Range: This EMF meter can measure a wide range of electromagnetic fields from 50 Hz to 10,000 Hz and can detect devices such as mobile phones and computers within a range of 2 feet. Wide Application: This EMF meter helps to measure electromagnetic fields to identify devices that produce high radiation levels and enables the user to determine the level of exposure to be limited, which is mainly used for testing TVs, computers, microw Specification: Item Type: EMF Meter Material: ABS Battery: 1 x 9V 6F22 battery (not included) Inspection Range: 0 to 20+ mGauss Detection Frequency: -50Hz (50 to 1000Hz ELF), (1000 to 20.000Hz VLF) Operating Temperature: -0 to 120°F (-18 to 49°C) Light: Dark green 0 to 1.5 mGauss, green 1.5 to 2.5 mGauss, yellow 2.5 to 10 mGauss, orange 10 to 20 mGauss, red 20 + mGauss Package List: 1 x EMF Meter 1 x Instruction Manual  Package List 1 x EMF Meter 1 x Instruction Manual