The IE-45 Audio Analysis System from Ivie is a completely new, calibrated, handheld audio instrument delivering a broad range of acoustical measurements. A vivid color display imparts more information to the customer.. In-the-field functions include real time analyzer measurements (RTA), sound pressure level (SPL) measurements, seat-to-seat level variation measurements, strip chart recordings of sound level over time, polarity checking, audio frequency oscilloscope measurements, Noise Criteria (NC/NR) measurements, a built-in signal generator, audio level volt meter, Spectrograph, and more. Optional RT60, STI-PA, LEQ, Record, and other measurements and functions now available. The IE-45 Digital Input Module interfaces via USB. IE-45 software runs on the Windows® XP™ platform. Delivering accurate measurement data in a highly readable, user-friendly format, the IE-45 provides unsurpassed convenience in a feature-rich package that offers complete portability.