A calibrated audio analysis system offering detailed Real Time Analyzer (RTA) and Sound Pressure Level (SPL) functionality incl. accurate and easy-to-use RTA, SPL Monitor, Strip Chart Recorder, Polarity Checker, Oscilloscope, Signal Generator, Audio Level Volt Meter, and more combined into an extremely convenient, brilliantly-colored, and useful PDA package. Virtually unlimited data storage and fully capable of downloading data to PC for archiving and graphic reporting using free IvieXLS (Microsoft Excel Template) software included with IE-33. Internal battery life: about 2 hrs in full energy burn mode. Standard HP/Compaq accessory battery (Ivie part #EP-1840) adds another two hours. *** RTA (FFT-based): -- 1/1, 1/3, 1/6 octave bands from 20Hz to 20kHz on ISO centers. -- Max resolution of 2048 data points (displayed at 240 freq. data points... much greater than 1/2 octave.) -- Weighted with A, C or Flat filters -- Accuracy +/- 0.5dB -- Adjustable display decay -- Peak detect and hold -- Freq. detect display -- Low freq. zoom (20Hz to 2kHz at 1Hz resolution) -- Powerful averaging (continuous or trigger mode) -- NC/NR -- (F)STC, STC, (N)NIC, NIC -- Easy subtraction -- and more. *** SPL: -- Response modes: fast, slow, peak, impulse -- 4 digit readout with 0.1dB resolution -- selectable weighting filters -- octave bandwidths @ octave centers -- meets ANSI S1.4-1983 Type II with standard Ivie mic or Type I with optional Ivie mic (1134) and preamp (IE-2P).