The battery operated compact data logger dl 101t has an internal temperature sensor the dl 121th additionally an air humidity sensor the measuring data is recorded automatically at adjustable intervals from 2 s up to 24 h at most 32 000 measuring values with the dl 121th 16 000 each for temperature and air humidity can be saved this enables data recording over several yearsa space saving installation via wall mount is also possible the data logger is connected to a computer like a stan