Thermo-Hygrograph Model 8145 Model 8145 Thermo-Hygrograph records precise measurements of temperature and humidity. The Durotherm sensing element for humidity will not dry out or get brittle with age - but will go on year after year recording the humidity of the air. It is temperature-compensated by a bimetallic strip which eliminates the expansion of the Durotherm elements due to temperature variations. Lufft's Thermo-Hygrographs differ from other manufacturers' units in this respect. The bimetallic temperature sensing element actuates the arm that records minute temperature changes. Easily calibrated. Can be certified to NIST

SPECIFICATIONS:

Model 8145 Range: +6 to 120°F, quartz clock drive, uses one AA battery. Can be set at either 7-days, 24 hr, or 31 days
Temperature Accuracy: ±1% of full scale
Temperature Sensor: Bimetallic spring Temperature Chart Increments: 2° divisions
Relative Humidity Range: 0 to 100%
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, included.
Case: White aluminum case with wrap around clear acrylic panels.
Size & Weight: Length 9-3/4", Width 5", Height 9-1/2", weight 6 pounds.