Referencing function Memory capacity of 1000 data items, enables data transfer to a PC via USB connection LCD backlight for easy operation in darker environments More connectors are optional and interchangeable by the user Two powering systems: Internal rechargeable batteries or AC adaptor Wide dynamic range and high power measurement capability High accuracy and Stabilized Auto-off function: saves the power and low power consumption allows extended operation in the field Three-year warranty and recommended calibration interval