K2 Meter

Have you ever thought what devices do ghost busters and paranormal researchers use? Then your answer is here in this post.
These devices are just EMF readers. A most famous and most widely used device is K-II Meter.

An Overview of the K-II Meter

The K-II meter, also known as the “Safe Range EMF”, is a simple, single-axis electromagnetic field meter. The device is enclosed within a hard plastic case and is powered by a single a 9-volt battery. A pressure-sensitive switch on the front turns the device on, using your thumb to maintain pressure (a quick hack is to slide a coin between the switch and case). There are modified versions available that have added a toggle switch, allowing power to stay on without the need to constantly hold the button down. 

Five LED lights constitute the display that divides the meter’s measurements (in milligauss) into five levels; 1 green = less than 1.5 mG,  2 green = 1.5 mG to 2.5 mG, 3 yellow = 2.5 mG to 10 mG, 4 red = 10 mG to 20 mG, 5 red = over 20 mG.  Once power is switched on, the device performs a Self-Test - it flashes the LED lights in succession, from the first to the last (green to red), then back down to the first green LED. It does this twice, and it does it quick (important to remember later on). 
The device operates on a 50 and 60 Hz level. It can detect Extremely Low Frequencies (50 to 1,000 Hz) & Very Low Frequency range (1,000 to 20,000 Hz). I should note that some retailers of this device advertise that it operates as low as 30 Hz [1]. A common misconception among paranormal enthusiasts is that when they employ these devices, they are measuring “the” electromagnetic spectrum – meaning the entire electromagnetic spectrum. The fact is, they are only measuring a small portion of the spectrum. The KII only covers the ELF and about 1/8 of the radio waves potion of the spectrum – a small fraction of the entire spectrum.

The response time of the K2 is almost instantaneous. As a “single- axis” meter, it only reads one axis, left to right (it does not read the other two axes). This means that the meter itself needs to be rotated on all three axes (X, Y and Z) in order to obtain the most accurate reading. From my own tests, the device best reads fields directly in front of it - holding the device so the LEDs are facing you and an EMF source is on the opposite side of the device. 

Once you open the device up and take a peek inside, its simplicity is revealed. There isn’t much to it - a circuit board and battery. The device is produced by a company named K-II Enterprises, which also produces three other devices The company also produces three other devices; The Dazer II® (an ultrasonic dog deterrent), the Pet-Agree® (Ultrasonic pet trainer), and the Tattle Tale® (A vibration alarm for training pets and security). 

The device weighs in at 3.8 oz., and measures 5.5 inches long, 2 inches wide and 1 inch in depth. While going through the company's website. I found no mention of its use as a paranormal detection device what-so-ever. It sells for $59.99.