The Thermor Bios Digital Wired Thermometer displays both indoor and outdoor temperatures as well as temperature trends.

It also displays the current time and features a freeze alarm plus a wired sensor probe that reaches 5 feet or 1.5 meters. This digital wired thermometer switches between Celsius and Fahrenheit at the touch of a button.

You can place this thermometer on top of your grow boxes and place its probe in the shade inside your grow box to get inside and outside temperature readings.