Testo 0560 6220 622 thermo hygrometer and pressure indicator testo 0560 6220 p the testo 622 thermo hygrometer and barometer is ideal for monitoring the ambient air it measures the air temperature relative humidity and the air pressure at a rate of once every ten seconds and displays the values including the time and date on the large easy to read display p a visual led alarm alerts the room s occupants when a threshold has been exceeded this meter allows you to keep an eye on ambient ai