Drum rotation 7 day;Sensors: Aged bimetal strip for temperature;Human hair bundle for relative humidity ;Measuring range: -15 to 40°C for temperature;5 to 100% for R. humidity; Accuracy: ±2°C (at 10 to 30°C) for temperature ±3°C(at other than above) for temperature; ±5% (at 15 to 25°C, 30 to 90%) for R. humidity; ±7% (at other than above) for R. humidity; Chart graduation 2°C for temperature; 5% for R. humidity; Recording pens: Cartridge pen (violet); Dimensions: (W)148 x (H)190 x (D)97 mm; Weight: approx. 1.6 kg; Accessories:7 day chart for 1 year use (55 sheets/pad), "AA" size battery x 1