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testo 605, the humidity measurement stick you can bend. Small, compact and accurate. The sensor remains stable in the long term guaranteeing accurate results even after years of use. You get dry bulb, dew point or relative humidity with the push of a button! Use for humidity checks and determination of areas where water is likely to condense. The 605-H1 will never run out of distilled water because it is not required, and the measurement is not air velocity dependent, so the readings will always be accurate. The 5" long probe allows for easy insertion into a duct, wall section or crawl space, for an easy and fast measurement.