METER
| Code | Name | Earliest evidence | Confidence | Files |
|---|---|---|---|---|
| M401 | 1968|1 | high | 7 | |
| M405 | Portable Extended Vu Meter | 1975|8 | high | 120 |
| M405C | Rack Mounted Extended Range VU Meter | 1975|8 | high | 67 |
| M405D | 1984|17 | high | 11 | |
| M405F | 1984|17 | high | 10 | |
| M405M | Extended Range VU Monitoring System | 1995|28 | high | 4 |
| M405P | 1990|23 | high | 15 | |
| M405PSS | 1975|8 | family | 1 | |
| M433 | Peak Program Meter | 1992|25 | high | 27 |
| M435 | 1994|27 | high | 22 | |
| M436L | 2014|47 | certain | 2 | |
| M445 | Extended Range Meter | 1996|29 | high | 98 |
| RM401 | 1968|1 | estimate | 20 | |
| RM405 | 1971|4 | low (named by) | 2 |