The Testo 0572 6174 Humidity and Temperature Probe is suitable for measuring temperature and relative humidity in storerooms and work rooms. The exceptionally small diameter of 4 mm also makes it possible to measure in small holes and narrow passageways. The probe can be installed for long-term measurements using a PG gland or clamp (not included). The probe's humidity sensor for measuring relative humidity is long-term stable, condensation-resistant and traceable to international humidity standards, such as ILAC, PTB and NIST. Thus, even after years of use you can still count on measurement results that are reliable and correct.