Wireless data logger testo Saveris 2-H2: With display for temperature- and relative humidity measurements, connection for internal capacitive humidity sensor, incl. USB cable, wall mount, batteries and calibration protocol. Range and accuracy correspond to probe. Wireless data logger testo Saveris 2-H2: With display for temperature- and relative humidity measurements, connection for internal capacitive humidity sensor, incl. USB cable, wall mount, batteries and calibration protocol. Range and accuracy correspond to probe.