The housing consists of a plastic-metal combination.
 The axes are supported by pivot bearing.
Two different models are available regarding the drum clockwork drive:
1. Mechanical drum clockwork mechanism with hand winding for the temperature range between -35...+80°C.
2. With 1,5 V Mignon cell (LR6A), battery operated and quartz-controlled step motor, with switchable thrusts in the temperature range between -20...+60°C.
Delivery includes one set of recording charts (100 sheets).
Order No.             Recording time                        Thrust
| 1.0660.xx.xxx | 1 day / 7 days | 40 mm/day, 11,45 mm/h | 
| 1.0664.xx.xxx | 14 days / 31 days | 20 mm/day, 9 mm/day | 
| 1.0665.xx.xxx | 1, 7, 31 days | Quartz clock work | 
|  |  |  | 
|  | Hum. meas. elem. | Measuring range | 
| .00.xxx | H (-35 ... +70 °C) | 10 ... 100 % rel. F. | 
| .02.xxx | K (0 ... +80 °C) | 0... 100 % rel. F. | 
| .0xx | lockable | No | 
| .9xx | Yes | 
| .x00 | Temperature measuring range | -35 ... +45°C (only H) | 
| .x05 | -20 ... +60°C (only H) | 
| .x11 | -10 ... +50°C (only H) | 
| .x12 | -10 ... +40°C (only H) | 
| .x14 | 0 ... +40°C | 
| .x15 | 0 ... +50°C | 
| .x16 | 0 ... +60°C | 
| .x17 | 0 ... +80°C | 
|  | Scale range | 0 ... 100% rel. h. | 
| Accuracy Hum. | ± 2% rel. h. (H), ± 3% rel. h. (K) | 
| Accuracy Temp. | ± 1 % of mr. | 
| Recording width | 2 x 82 mm | 
| Graduation | 5% rel. F. / 1 resp. 0,5°C | 
| Dimension | 280 x 138 x 285 mm | 
| Weight | 2,7 kg |