US Army, Technical Manual, TM 5-6675-329-13&P, SELF-LEVELING SURV LEVEL, (WILD HEERBRUGG MODEL NA2-80), (NSN 6675-01-101-4724)
| Country | USA |
| Brand | Sonic Energy |
| Manufacturer | Meinl |
| Binding | Electronics |
| ItemPartNumber | CH-TT20 |
| Model | CH-TT20 |
| Warranty | 2 year manufacturer. |
| Color | Bronze |
| Size | 20" |
| UPCs | 842960105605 |
| EANs | 0842960105605 |
| ReleaseDate | 0000-00-00 |