Features : Instantly respond to EMF fluctuations and spikes. Need 9 volt battery (preferably using for Polaroid 9 volt battery) Easy to read LED lights in the dark and in the sun Portable, easy to use, rugged, reliable, super responsive UV reactive color label Used for ultra-normal wave research and general electromagnetic field testing Introdution: K2 flowmeters are often used during ghost hunting and are also used for personal safety to identify potentially harmful high EMF radiation. The K2 flowmeter is known for its reliability and quality in the investigation of paranormal phenome non . This makes the K2 EMF instrument an excellent tool for detecting mental activity and finding potentially harmful high EMF levels in a home or work environment. Specification : 1. Material: ABS 2. Features: Test Gaussian, stay away from radiation, good for health 3. 5-LED special function indicator, representing different radiation values; easy to use; 1x9V (including power supply) 4. 50/60Hz frequency monitoring application 5. Dark green 0.1.5mm; green light 1.5~2.5mg; yellow 2.5-10mm 1/2; orange 10 to 20ml; red 20+mm Dimensions: 14.3 cm x 2.9 cm x 5.3 cm includes: 1 *EMF Meter( (not including battery) 1 *English user manual