The Mestek AC40 is a high-precision non-contact voltage tester designed for safe and convenient electrical detection. It features a wide AC voltage sensing range of 12–1000V, making it suitable for household, office, and industrial use. With dual sensitivity modes, it allows users to choose between high and low detection ranges for more accurate results. The pen-style tester provides visual LED indicators, audible alarms, and vibration alerts to instantly notify you of live wires. It also includes a built-in flashlight that helps you work in dark or tight spaces. Powered by two AAA batteries, the device offers auto-shutdown and a low-battery indicator to extend operational life. Durable, reliable, and easy to use, the Mestek AC40 is an essential tool for electricians, technicians, and DIY users who need quick and safe voltage detection.