HIOKI Clamp On Power Logger PW3360-20,used to record power variations over extended periods of time. It has an optional SD memory card,used to record about one year of measurements at 1-minute intervals, provides a source of data for verifying energy-saving benefits.Basically, its operating temperature range of -10C to 50C,in HIOKI devices (0C to 40C), which enables measurement in harsh environments.It has a Quick Set navigation feature,which allows users to start measurement by a series of step-by-step instructions that configures the instrument, makes & checks connections, and start recording. It has a clamp leak sensor can be used with the PW3360-20 to measure leak current.