HP 8903A Audio AnalyzerCondition:* Used. Powers on, all buttons trigger associated function on panel.* Sold as-is.Additional Notes:* Frequency Range: 20Hz to 100kHz* Frequency Resolution: 0.3%* Frequency Accuracy: 0.3% of setting.* 3 filters: 400 Hz hi pass, 30 kHz and 80 kHz low pass* Input voltages can be measured from 300.0 V to 0.3 mV with a true RMS detector* SINAD is measured over a range of 0 to 99.99 dB with 0.01 dB resolution* An internal frequency counter will measure frequencies from 20 Hz to 100 kHz* Signal-to-Noise ratios can be measured over a range of 0 to 99.99 dB