Sauermann KH220-O Multifunction Datalogger for 7 Parameters with Universal Probe is designed to datalog up to 1 million datapoints. The Sauermann KH220-O can datalog temperature, humidity, and light from the get-go using its internal sensors, but it can also datalog water pressure, light, pulse, voltage, current, temperature, and humidity using optional external sensors. The Sauermann KH220-O features two-user configurable alarm set points, quick data transfer to PC, a convenient magnetic backing for quick and easy mounting, and more.