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
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.