Depending on the specific EEG machine and paper combination there can be a variety of options for the use of the machine, more specifically the graphs that the machine produces. The speed of the machine can be adjusted to meet the needs of the specific test of the brain's electric activity. The standard speed, which is used internationally, is 3 centimeters per second. This is why most EEG paper that has grids will have lines at the location of every 3 cms, which would correspond to one second of time in the test. Time markers on the grid can be further subdivided to allow very accurate readings of the data at both faster and slower speeds, providing the grid has the subdivisions. The machine does need to be calibrated between changes of speed to ensure that the paper is moving through the machine smoothly and without jerking or changing speeds. Even a tug at the paper for a fraction of a second will impact the reading from that point on in the test. Choosing the highest quality EEG paper, especially if you are using a variety of speed settings, is of great importance. What are the different sizes of sheets of EEG paper available? The different sizes of EEG paper are designed for specific machines and uses. In general both grid and non-grid markers on the paper are possible on any size of paper. Common sizes include 100, 210, 245, 345, 365 and 400 millimeters by 300 millimeters. Another option of 210mm by 150mm is also possible for Bond EEG medical recording charts. The sizes of the packages and cases of these papers will also vary with options from 25 pages per package through to 1000 pages per package. Most cases include at least three packages, but again different manufacturers may offer different packaging options. Typically buying larger bulk packages by case lots will save you money over both the short and long term. This paper is simple to store and requires no special accommodations other than a dry, dust free area. Since it is not a thermal paper there is no concern about heat sources or direct sunlight possibly starting chemical reactions and altering the color or quality of the paper. Of course storing out of direct sunlight once opened is always an important consideration. What features are variable between different types of EEG paper? Besides the size the biggest variation between EEG paper styles is the grid. Some paper has no grid at all and is used in general types of tests where time may not be required as a variable on the test. Grid EEG paper can include a variety of grid subdivisions as well different colors. The most popular grid colors include red, green, yellow and orange grid lines. Depending on the tracer or pen color used different grid lines may be more distinct and easy to see quickly.