Sauermann KT220-O Multifunction Datalogger Temperature and 5 Other Parameters records up to 1 million datapoints. The Sauermann KT220-O datalogs temperature readings via its internal temperature sensor, but it can also datalog via external probes that measure temperature, humidity, current, voltage, pulse, and water pressure. The Sauermann KT220-O features a large, easy-to-read 2-line LCD screen, a convenient magnetic backing for quick and easy mounting to metal surfaces, two user-adjustable alarm set points, free software, quick data transfer to PC, and more.