Testo 610 - Pocket Sized Air Humidity Measuring Instrument (Part Number 0560 0610) Long term stable Testo humidity sensor +/-2.5% RH accuracy Dewpoint calculation and wet bulb included Protective cap for safe storageThe Testo 610 simultaneously measures relative air humidity and temperature. It is thus ideally suitable for fast checks on ambient conditions, e.g. in offices, production rooms or in warehouses.The patented humidity sensor developed by Testo guarantees reliable measurement results with an accuracy of +-2.5 %RH. The 610 also features calculation of dew point and wet bulb, as well as a hold function, and display of max and min values.The clip on protective cap, wrist strap and belt holder ensure safekeeping of the instrument. The Testo 610 is very handy, small and easy to operate.