Feature:1.It has a press down button to activate it and it requires this to be held down to monitor readings. This modification adds a switch to the circuit which produces the same effect as if the button was held down.2.Other possible modifications would be to add an output jack and digital meter to the KII - this is looked at in the Trifield Natural EM Meter Modification and specifics given in the tech bench board on the GRI Forum.3.K-II output being logged along with Magnetic Field, Temperature and light intensity.4.First a little background on the KII meter. It has 5 lights which indicate the level of EMF:Green - Always on indicating battery OK and a "normal" level of 0 to 1.5 milliGaussGreen - "Low" 1.5 to 2.5 milliGaussYellow - "Caution" 2.5 to 10 milliGaussOrange - "High" 10 to 20 milliGaussRed - "Warning" 20+ milliGauss5.Frequencies detected are 50/60Hz (50-1000Hz - ELF) (1000-20,000Hz - VLF), Accuracy 5% (typical).6.The KII differs from many other low cost meters in that it not only measures the Electro Magnetic Field in the Extremely Low Frequency (ELF) range, but also the Very Low Frequency (VLF) range. The ELF range which is generally termed to be between 3-3,000Hz borders on DC as well as AC.7.Higher priced meters such as the The Tri-Field Natural EM meter are designed to be able to operate exclusively in the natural DC range which is from 0-3Hz (Sub Extremely Low Frequency - SELF) and includes the frequencies of humans and the earth itself.OPERATION OF THE K-IIWhen the meter is initially turned on it gives a full scale reading and then a half scale to indicate it's powered up. It then returns a normal reading with one green LED illuminated - indicating 0-1.5mG. Any disturbance will now be indicated by the meter. If the finger is lifted the single LED will extinguish indicating the unit is off.The benefit of the modification is obvious and rules out the possibility of human intervention (accidental or otherwise) with the meter's original momentary switch. Such intervention can be noticed by the first light (green) going out before a "spike" occurs - this single light should always be on indicating the unit is powered up.Size: 14.3cm x 2.9cm x 5.3cmDark Green 0 1.5 mG; Green 1.5 to 2.5 mG; Yellow 2.5 to 10 mG; Orange 10 to 20 mG; Red 20 + mG;Material: ABSColor: Black/GreyApplied 50/60Hz frequency monitoringTest Gaussian to keep you safe from radiation and good for your healthSpecial function 5-led indicators, respectively representing different radiation values; easy to use;Package Include: 1 * Counter Nuclear Radiation