TA821A is a handheld 3999-count True RMS digital multimeter in the TA821 Series. It can also be described as a digital multimeter, handheld multimeter, multi-function electrical tester, portable multimeter tester, or voltage/current/resistance meter. Featuring a clear LCD display, the meter supports essential measurement and testing functions including AC/DC voltage, DC current, resistance, continuity, diode testing, NCV non-contact voltage detection, and live wire identification. It is well suited for a wide range of applications such as electronics repair, electrical troubleshooting, residential wiring inspection, distribution panel checks, equipment maintenance, basic industrial service, educational labs, DIY projects, facility maintenance, and general household testing. The TA821A also includes data hold, display backlight, flashlight illumination, and auto power-off, making it practical for low-light and on-site working environments. Designed in compliance with EN IEC 61010-1 and rated CAT III 600V, it is a reliable and practical solution for everyday electrical and electronic measurement tasks.