Features: 1. Easy to read multi-segment LED display. 2. The range of EMF meters for use helps measure electromagnetic fields to identify devices producing high levels of radiation, enabling users to make informed decisions about findings. 3. Measures wide spectrum EMF from 30 Hz to 20,000 Hz, it can check mobile phones within 2 feet. 4. Safe and convenient push-up/push-down operation. Portable, easy to use, durable, reliable, responsive. Easy to read LED light scale in dark and sunlight. Five levels: (1) The first light detects a normal EMF field, which is always around us. The range is between 0 and 1.5 mG (2) The second light (green) detects a low-level EMF ranging from 1.5 to 2.5 mg. (3) The 3rd light (yellow) detects an intermediate EMF in the range of 2.5 to 10 mG. (4) The 4th lamp (orange) detects a high-level EMF field in the range of 10 to 20 mG (5) The 5th light (red) detects a very high EMF range of 20+ mG Specification: Color: black, grey Material: ABS Accuracy: +/- 5% Battery: 1 x 9V battery Detection Range: 0 to 20+ milliGauss Detection frequency: 30 - 20,000 Hz Size: about 14.3cm2.9cm5.3cm/5.62*1.14*2.08in Product List: LED EMF Meter*1