The Hobo UX90 motor on/off logger is a matchbox-sized, LCD data logger for monitoring run times of motors, pumps, compressors and other equipment. The new logger provides a simple and convenient way to record up to 340,000 equipment on/off cycle changes, and uses powerful graphing and analysis software to convert the recorded data into time and date stamped graphs. The logger will be used in a broad range of building performance monitoring applications, including HVAC/R systems diagnostics, compressed air systems monitoring, and general troubleshooting of motors, pumps and fans.