The SL702-128K is a temperature and relative humidity data logger. It has internal temperature and relative humidity sensors and the option of an additional, external temperature & relative humidity sensor (SL-EH020). The SL702-128K is small and compact and is ideally suited measuring temperature & relative humidity in buildings and museums as well as for goods in transit. As with all of the SL700 series data loggers, the data logger is supplied in a Noryl enclosure, is battery powered for up to 10 years and has 12 bit resolution. There is only one memory option for the SL702-128K, storing 87,000 readings.