The TIS 851 is an exclusive voltage and continuity tester with a built-in self-test function, conforming fully to BSEN 61243-3:2010 and HSE GS38 12B. It features an additional built-in two-pole phase rotation test. The tester will not trip any RCD when testing between live and earth. It provides digital LCD and LED voltage indication, and also shows the presence of voltage without battery power. Additional features include AC/DC Voltage up to 690V, Continuity Test with Buzzer, Phase Rotation Test, Cat III 1000V, CATIV 600V ratings, Built-in Self Test, Polarity Test, Auto Power On/Off, and a protective case included. It comes with a 2 Years Warranty. The tester is designed for quick and accurate detection of voltage in electrical circuits with clear indicators for live wires, outlets, and switches. Continuity testing verifies the integrity of electrical connections, wires, and cables, indicating complete circuits or breaks. Its compact, lightweight, and ergonomic design ensures easy handling and comfortable grip. Clear LED indicators and audible alerts provide intuitive feedback, making it suitable for both professionals and DIY enthusiasts. Built with quality materials and rugged construction, this tester is durable and provides reliable performance in challenging environments.