This document introduces the features and functions of the digital clamp meters KEW-2040 and KEW-2055. These clamp meters comply with international safety specifications and have comfortable grip, data hold function, LCD backlight function (only for KEW-2055), REL function, MIN/MAX function, continuity/diode test function, NCV (non-contact voltage) detection function, etc. At the same time, these clamp meters have 600V input protection, automatic power off function, and bar graph display.