Humidity measuring range  | 
    0 ... 20% (accuracy: ± 4% rh)  20 ... 40% (accuracy: ± 3% rh) 40 ... 60% (accuracy: ± 2% rh) 60 ... 80% (accuracy : ± 3% RH) 80 ... 100% (accuracy: ± 4% RH)  | 
  
Measuring range temperature  | 
    -30 ... -19.9°C / -22 ... -3.8°F (accuracy: ± 1.0°C / 1.8°F)   | 
  
Resolution air humidity  | 
    0.1%  | 
  
Resolution temperature  | 
    0.1°C / 0.18°F  | 
  
Units of measurement  | 
    °C   | 
  
Measurement parameters  | 
    % RH, GPP (grains per pound), g / kg,    | 
  
Display  | 
    Dual LCD  | 
  
Response time  | 
    < 15 seconds  | 
  
Sensor type  | 
    Humidity: Precise capacitive   | 
  
Absolute humidity  | 
    0 ... 500 g / m³   | 
  
Measuring range dew point temperature  | 
    -30 ... 100°C / -22 ... 212°F  | 
  
Wet bulb temperature measurement range  | 
    0 ... 80°C / 32 ... 176°F  | 
  
Operating conditions  | 
    0 ... 50°C / 32 ... 122°F, < 80% RH (non-condensing)  | 
  
Storage conditions  | 
    -40 ... 85°C / -40 ... 185°F, < 99% RH (non-condensing)  | 
  
Power supply  | 
    9V block battery  | 
  
Battery life  | 
    Approx. 48 hours  | 
  
Dimensions  | 
    300 x 75 x 50 mm / 11.8 x 3 x 2 in  | 
  
Weight  | 
    400 g / < 1 lb  |