The ASA10B is a ten band single octave battery operated portable audio spectrum analyzer complete with built-in microphone, an accurate dB meter and will read Sound Pressure Levels in either "A", "C" or FLAT weighting. The ASA10B is often used in conjunction with a pink noise generator such as the Gold Line PN2. Pink noise is a sound that has equal amount of energy per octave of bandwidth. By inputting pink noise to a sound system you are certain that the system is receiving a flat signal source. Pink noise is the basic reference for all measurements and adjustments to a system. With the pink noise fed through a sound system, any deviations from flat response will be shown on the analyzer. The ASA10B is CE Approved.