The use of broadband pass technology within device which means being more sensitive than other EMF meters in picking up electromagnetic frequency.<br> There are 5 colour LED signals to different level of magnetic field. It is suitable to use either indoor or outdoor applications for measuring any electric device, power line<br> Measure wide spectrum of EMF from 50 to 20,000 Hertz<br> Identify potentially harmful long term overexposure to EMF<br> Sensitive in detecting electromagnetic field. Simple & user friendly device. Light weight<br> Specifications<br> Detection range: 0 to 20+ milliGauss (mG)<br> Detection frequency: 50 / 60 Hertz (50 to 1,000 Hz - ELF; 1,000 to 20,000 Hz - VLF)<br> Accuracy: +/-5% (Typical)<br> 5 LED signals for different level of magnetic field:<br> Green (1) - Normal magnetic field (0 - 1.5 mG)<br> Green (2) - Low level magnetic field (1.5 - 2.5 mG)<br> Yellow - Mid level magnetic field (2.5 - 10 mG)<br> Orange - High level magnetic field (10 - 20 mG)<br> Red - Extreme high level magnetic field ( 20mG)<br> Operating temperature: -18 to 49Celsius (0 to 120Fahrenheit)<br> Power source: 9V battery<br> Weight: 170g<br> colour: black<br> Material: ABS, Electronic component<br> size: 14.6*5.8*25.5cm<br> Package Contents:<br> 1* K-II Electromagnetic Flowmeter<br> 1* Instruction Manual<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.