Innumerable cases of avistamentos of ufos have been told in the entire
world where electromagnetic riots occur; such as pane in engines of vehicles in movement, loss of electric energy in residences and even in entire cities, also "inexplicable" blackouts in hidroelétricas plants, static noises, interferences in radios and televisions, motores, etc...
The base of functioning of this device that I developed is of a magnetometer, or either; a developed device to catch variations in electromagnetic fields.
Based in these facts, I imagined that a device thus could very assist my research for my surprise, after to look in all the possible places, electronic industries, I did not find no specific device for use in ufologia, this was in 1988 middle, from there in ahead after many tests, being entrepreneur technician in electronics, I finished for developing a unit which led in vigils with friends of the region.
After some nights of vigils, the device accused a avistamento, thus the good functioning of the device was proven, what it left me livened up therefore was in the certain way of the research of electromagnetic interferences of ufos.
Com o passar do tempo, some colleagues of vigils had been interested in the device and had been making orders, at the same time where I improved the circuit, looking for to make with that it was each more sensible time, of more practical use and easy adjustment.
The first model was with layout in the panel was vendido in 1989.
Below the photo of the first unit...

The time was passing, many vigils, many nights without sleeping, many bites of pernilongos, e some avistamentos, many new friendships knowing colleagues of other cities and the UFO Detector followed its evolution until I was stimulated by friends to display the device in Reviewed celebrity UFO, why they said that she had many all other ufólogos in Brazil that could have interest in the device and the only form, at the time it was to place a propaganda in a specialized and serious magazine so that they could have knowledge of the existence of this device.
In fact, após a primeira publicação na Revista Ufo, I was surpreso and up to one in such a way worried about the amount of phone calls that I received from people of all the cantos of the country wanting to also acquire the device and more information on its functioning...
I was worried because I mounted and until today, I mount this device personally, how it could give account of as much order? One by one, I was taking care of and with passing of the time, the colleagues who had acquired the UFO Detector, they had started to bind counting to its experiences in vigils and some cases of avistaments with the device, unhappyly, at that time still it did not have the InterNet and the communication was difficult for the high cost of the telephonic linkings and it was
not possible to keep contact with as many people.. 
Today, I continue to work in the perfectioning of the circuit of the UFO Detector... in the few vacant hours and finally now, I place the disposal of the colleagues of ufológicas research, the third generation of the UFO Detector, with still more sensible an electronic circuit, esperando assim estar colaborando para que um dia, I wait that in briefing, let us have the solution and clarifications of the governments on the visits of ufos in our planet!