Spring wound- no batteries required!
Made of corrosion- resistant acrylic for indoor or sheltered outdoor use. Spring winding keeps chart running for eight days. Even when the motor begins to run down, a steady chart speed is maintained. Includes one 1-day gear and one 7-day gear, two felt-tipped pens (red and blue), and one 7-day rotation chart.
- Record temperature and humidity on 1 or 7 day rotation
| Thomas No | Mfr No | Description |
|---|---|---|
| 1213W96 | 37250-10 | Hygrothermograph, Two-Speed |
