In the life of every day electronics occupy a place of all relief also in the most simple things. Above all, in these last times, it has invaded spaces that, until now, were reserved to other disciplines, like the electrical engineering, the mechanics, etc. Moreover, it has become present in every aspect of the life inside our houses, and even more in our automobiles. Then, is an incresing requirement to have electronic instruments to misure and check if all the devices we have around us are in good shape and perfect efficency. Unfortunately new instruments have reached prohibitive prices: from here comes the necessity to find other ways to find good instruments at more accessible prices. That means, a refurbished instrument. What is it? Often, the people who are used to visit trade fairs of electronic may find vendors, more or less improvised, selling measure instruments. They usually sell surplus equipment, of the most different kind, but usually coming from junk dealer or part of equipment eliminated by closed companies. Obviously, instrument like these are sold "as the are", often broken, nearly always out of calibration and dirty. Sometimes the price may look tempting, but the customer must pay attention and be doubtful about these offers, since vendors are well aware of the real value of their goods. The risk for the purchaser is not only to buy an unreliable instrument, but also to have trown away their moneys when they realize to not be able to repair those instruments, loosing more money when they have to give them to some qualified technician for the necessair repairs. As a matter of fact, is not advisable to try to self-repair measure instruments, as they have to meet specific standards of accuracy and calibration. All these parameters must be known, otherwhis they are dangerous to use as they can provide false informations about their readings. Even more when they are used in professional works. All these examples show what is NOT a refurbished instrument. On the other hand, a true refurbished instrument is a device recovered in a laboratory where it is checked, calibrated, eventually repaired and substitued of defectives parts, to make it come back to the original characteristic listed in the handbook provided from the manufactoring company. Therefore, it is possible to have equipment maybe not exactly new, sometimes quite big, but with the same reliability of a new one at a competitive price. To carry out this job is required high technical competence, sometimes much patience to find replacement parts. Obviously all this work have impact on the final price, that are higher than what you can find in some trade fair, but they are a warranty of the reliability of the instrument. This never happen for the instruments you can buy from not specialized companys or vendors. And this is a fact that people must be keep in mind before making any purchase of an electronic instrument.