| Audio Analyzer |  |
| Digital Multimeters | ||||
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| Model | 2015 | 2015-P | 2016 | 2016-P |
| Description | Total Harmonic Distortion Multimeter | Audio Analyzing Digital Multimeter | Total Harmonic Distortion Multimeter | Audio Analyzing Digital Multimeter |
| Source Output | N/A | N/A | 9V | 9V |
| Digits | 6½ | 6½ | 6½ | 6½ |
| Interface | GPIB, RS-232 | GPIB, RS-232 | GPIB, RS-232 | GPIB, RS-232 |