Item Type: Soil Tester_x000D_ Material: ABS, Metal_x000D_ Soil Temperature Range: - 20 to +70 (- 4 to +158 )_x000D_ Air Temperature Range: - 10 to +50 (+14 to +122 )_x000D_ Air Humidity Range: 20% to 99% RH_x000D_ Power Supply Mode: 1 x 9V 6F22 dry battery 280mAh (with)_x000D_ Probe Length: Approx. 22cm / 8.7in_x000D_ Basic Functions:_x000D_ Air temperature_x000D_ Air humidity_x000D_ Illumination display_x000D_ temperature switching display_x000D_ Data retention function_x000D_ Comfort display_x000D_ Key function:_x000D_ ON OFF: Switch on key, short press to turn on, long press to turn off for 3 seconds, and automatically turn off after 15 minutes without operation_x000D_ : Switch the temperature unit to display in (Celsius) or (Fahrenheit)_x000D_ HOLD: Data locking