What you see here is a true gem and if youre looking at it you probably know what it is: an Audio Precision Portable One Dual Domain P1DD Audio Analyzer capable of incredible performance in either the analog or digital (96k) domains. This unit is in fantastic shape and passes all self tests. Full performance testing of Amps, DACs, you name it, including jitter, THD, Frequency Response, and many more tests, with no need for an external computer to run it. It is fully self-contained. This unit includes a few extra features: Intermodulation Distortion measurementGPIB interface- 96kHz digital FLP-A20K filterAudio Precision Carry CaseUser manual Low Distortion:Analog System THD+N 80 kHz BW –92 dBDigital Distortion THD+N –140 dBHigh Analog BandwidthSignal Generation to 120 kHz Low Noise:22 Hz–22 kHz < –114 dBuA-weighted < –118 dBuWide Input Voltage RangeInput Range 80 mV–250 V in 10 dB steps Flat Response:20 Hz–20 kHz ±0.05 dB Low Crosstalk:Input < –120 dBOutput < –110 dB Low Jitter:Generator < 0.8 nsAnalyzer < 1.6 ns