The oscilloscope, once called an oscillograph, can be a very important tool for electronic testing. These devices are able to allow the observer to see the various and constant changes in signal voltages. You will be able to see the change in the voltage with a light on the face of the cathode ray tube. These tools are quite common in a number of different industries as well as in scientific laboratories. They are very useful when it comes to helping adjust various types of electronics so that they are working to exact specifications. In fact, the oscilloscope are so accurate that they are able to detect and follow changes that occur within less than a billionth of a second. This is going to ensure greater accuracy.