The Onset HOBO UX120-006M is a high performance 4-channel analog data logger designed for building performance monitoring. The logger features a large, easy to read LCD display and can be used to measure and record data from up to 4 external analog sensors (Must be purchased separately). The UX120-006M is an ideal solution for performing energy audits, equipment scheduling, and building commissioning studies but the wide selection of available analog sensors make it a perfect choice for a wide range of other indoor applications. The logger can store 1.9 million measurements (readings) ensuring longer deployment times between downloads. Logger setup is easily done using the free HOBOware software or advanced HOBOware Pro software. Both of which allow for graphing and detailed data analysis. The UX120-006M supports the following measurements: 4-20mA, AC Current, AC Voltage, Carbon Dioxide, Compressed Air Flow, DC Current, DC Voltage, Differential Pressure, Gauge Pressure, Kilowatts (kW), Temperature, and Volatile Organic Comp (must be purchased separately).