This instrument is used to measure and record the atmospheric air pressure. 
The recording is carried out by means of a hand wound clock work drum mechanism acc. to DIN 8300 and DIN 58658 (3.0800…; 3.0804…) or with a Quartz clock work (3.0804…). 
The on-site-elevation can be set by means of an adjusting screw.
Delivery includes a set of recording charts (100 sheets).
| Order-no. | 
|  | Recording time | Thrust | 
| 3.0800.10.xxx | 1 day, 7 days | 11,45 mm/h., 40 mm/day | 
| 3.0804.10.xxx | 14 days, 31 days | 20 mm/day, 9 mm/day | 
| 3.0805.10.xxx | 1 / 7 / 31 days | as aforesaid | 
| .000 | not lockable |  | 
| .900 | Lockable |  | 
|  | Measuring range | 945 ... 1052 hPa | 
|  | Graduation | 1 hPa | 
|  | accessory | ±0,8 hPa | 
|  | Above sea level | 0 ... 3000 m | 
|  | Measuring element | Aneroid-capsules, temperature-compensated | 
|  | Ambient temperature | -10 … +45 °C | 
|  | Recording width | 82 mm | 
|  | Dimension | 280 x 138 x 214 mm | 
|  | Weight | 2,3 kg | 
| Accessories |  |  | 
| 500847 | Felt pen | Colour violet | 
| 205184 | Recording charts (100 pcs.) | 1 day | 
| 205182 |  | 7 days | 
| 205185 |  | 14 days | 
| 205186 |  | 31 days |