THERMO  HYGROMETER Model : 4G     Temperature Range  Indoor  : -10°C to +50°C (+14°F to +122°F) Outdoor  : -50°C to +70°C (-58°F to +158°F ) Humidity Range  : indoor 20% to 99% RH ( When ther humidity < 20% RH, display 10% RH directly.) Power - supply ...