AEMC 1823 [2121.76] RTD Thermometer/Data Logger*DISCONTINUED*. The RTD 100 and RTD 1000 Thermometer Data Logger Model 1823 is a portable, compact digital meter designed for simplicity and one-hand operation. The main advantage of the logger is its ability to perform a variety of recording tasks with easy and intuitive setup from a computer using supplied DataView® software. RTD sensor not supplied.