Klein Tools' 400A AC/DC Digital Clamp Meter w/ TRMS Auto-Ranging combines practical testing functions with features suited to demanding field work. A high-visibility reverse-contrast LCD improves readability across changing ambient light conditions, while Max/Min, Rel/Zero, and Data Hold functions help capture useful measurements during troubleshooting. The meter is built to withstand a 6.6-ft. drop and carries a CAT III 600V, Class 2, double-insulation safety rating. Included test leads, thermocouple, carrying case, and three AAA batteries provide a ready-to-use testing setup for professional and DIY electrical work.