The TA804 Series Smart Digital Multimeters are high-performance auto-ranging electrical test instruments designed for electrical inspection, electronic maintenance, and daily troubleshooting applications. Featuring a 3 5/6-digit LCD display with up to 5999 counts, the series supports intelligent measurement modes, automatic/manual range selection, and fast measurement of essential electrical parameters including AC/DC voltage and resistance. As a professional Digital Multimeter (DMM), voltage tester, resistance meter, electrical measuring instrument, and circuit diagnostic tool, the TA804 Series complies with the IEC61010-1 international electrical safety standard and integrates comprehensive overload protection. With up to 600V AC/DC voltage measurement capability, it provides reliable and safe performance for residential electrical testing, equipment maintenance, and field service applications. The TA804B multifunction model further enhances measurement capability with capacitance testing, diode testing, continuity buzzer function, NCV non-contact voltage detection, and live/neutral wire identification, making it suitable for more advanced circuit inspection tasks. Powered by 1.5V AAA batteries, the meter features data hold, auto power-off, and a compact lightweight design for convenient operation and portability. It is widely used in home electrical installation, building maintenance, appliance repair, low-voltage engineering, electronic laboratories, technical training, industrial equipment inspection, and DIY electronics projects, making it an ideal handheld testing solution for electricians, maintenance technicians, engineers, and electronics enthusiasts.