- No Battery Needed: Enjoy an eco-friendly design that eliminates the need for charging. This energy-saving feature helps reduce pollution and ensures hassle-free operation. - Wide Frequency Range: Accurately measures frequencies from 20Hz to 400Hz, providing reliable results for various applications, from audio testing to electrical diagnostics. - Robust and Safe: Built to withstand up to 2000V per minute, with an impulse voltage rating of 4000V, ensuring maximum safety during use in high-voltage environments. - Precise Detection: Equipped with LED indicators and a buzzer, this device effectively signals open phases and phase sequences, guaranteeing correct identification of three-phase systems. Applications: - Ideal for electricians and technicians conducting electrical inspections and troubleshooting. - Useful in audio engineering for frequency response testing of speakers and amplifiers. - Perfect for maintenance professionals ensuring the integrity of three-phase power systems in industrial settings.