The ACR Systems JR-1000-SP [01-0192] Single Channel Temperature Data logger, Starter Pack. With its precision calibrated internal temperature sensor, simply place the logger in the field and leave it to record. Once the desired information has been recorded, plug the logger into the serial port of your computer and begin downloading and viewing the logged data with ACR’s TrendReader® 2 Express software or feature filled TrendReader® 2 software.