The white dome on top of Clima houses its sensors. Touching it does not harm the sensors inside, but Clima will begin reading the temperature and humidity of whatever is nearest to it. To get a reading of the atmosphere in a particular location, there should be nothing between the dome and the atmosphere you are measuring.
If you are using Clima to take data readings from a specific location, either place your NODE on a flat surface with Clima facing up, or hold NODE upright and steady.
If you are using Clima to log data for later inspection, keep the device in a safe, dry location that does not obstruct the sensors. For example, place your NODE in a backpack pocket to measure humidity and altitude during a hike, or enclose it in a Ziploc bag to measure outdoor temperature overnight.