This is a digital combination hygrometer/thermometer. It's easy and convenient to use - includes a 4.5 ft probe, so you can read data without entering your grow space. Shows both internal and external temp. Reads Fahrenheit and Celsius. Can be wall mounted or desktop. Digital LCD display. Uses 2 AAA batteries.
It's alright , can't beat it at $12. But be careful of the little cord for the outside sensor, mine came off shortly after I received it . But everything works just fine, I just had to put the unit in my rent. Anywho , this is an awesome place to get your cultivation goods.