| | Manufacturer | Part No | Description | Available | Price |
| Buy | Ballantine | | 320: True RMS Electronic Voltmeter Instructions. (200959) | 1 | $25.00 |
| Buy | Ballantine | | 320: True RMS Electronic Voltmeter Instructions. (200960) | 1 | $25.00 |
| Buy | Ballantine | | 320A: TRMS Electronic Voltmeter Instruction Book. January 1964. (200961) | 1 | $25.00 |
| Buy | Ballantine | | 345: Logarithmic DC-AC Voltmeter/Ohmmeter Instruction Book. December 1964. (200962) | 1 | $25.00 |
| Buy | Ballantine | 12-64-Y-1 | 345: Logarithmic DC-AC Voltmeter/Ohmmeter Instruction Book. 1964. (201068) | 1 | $25.00 |