Thermo-Hygrograph Model 8147 The Model 8147R records precise measurements of both temperature and humidity. The Durotherm sensing element activates the arm that records the humidity and the bimetallic temperature spring activates the arm that records temperature. Easily calibrated. Quartz clock powered by one "AA" Battery. Revolution: Can be set for either 24-hr, 7-day, or 31-day.
 

SPECIFICATIONS:

Temperature Range:  +6  Temperature Range:  +6  to  120°F
Temperature Accuracy: ±1% of full scale
Temperature Sensor: Bi-metallic spring
Temperature Chart Increments:  2° divisions
Relative Humidity Range:  20 to 90%
Relative Humidity Accuracy: ±3% Relative Humidity
Relative Humidity Sensor: Durotherm Element
Relative Humidity Chart Increments:  2% divisions

Recording Pens: Long-writing felt tipped nibs (two included)
Charts:  One year supply  (55 charts of 24 hr/7day)
Case:   Clear Acrylic
Size & Weight:  Length 9-7/8" , Width 5-1/8",  Height   9",  Weight 5 pounds.