TRIXES Indoor/Outdoor Digital LCD Thermometer and Hygrometer Greenhouse Home Min/Max temperature memory for Indoor and Outdoor sensors Built-in indoor temperature and hygrometer/humidity sensor and attachable outdoor temperature sensor Temperature range; Indoor: -10C(+14F) to +50C(+122F), Outdoor: -50C(-58F) to +90C(+194F) Hygrometer sensor Relative Humidity range: 20% RH to 99% RH, 10% RH is displayed when below 20% RH Comfort indicator shows smile when indoor temps are within 18 to 25C and humidity is within 40% to 65% RH