The Ivie Technologies IE-30A Audio Spectrum Analyzer 25Hz - 20kHz one of the most powerful, portable, and accurate analyzers available. The IE-30A combines a full octave and 1/3 octave real time spectrum analyzer with a Type I precision sound level meter. Included with this package is an instrumentation quality, air condenser microphone and preamplifier. For years, air condenser microphones have been recognized as the world standard for accuracy. Additionally, the IE-30A is calibrated both in dB SPL and in dBμV, which makes it suitable for a wide variety of simple and complex measurements, including sound pressure level, amplifier gain, frequency response, output power, peak accumulation, and impulse measurement, just to name a few.