UYIGAO UA21B AC Voltage Detector

The UYIGAO UA21B is a pen-style, non-contact AC voltage detector designed for electricians and homeowners to safely check for the presence of alternating current (AC) in circuits, wires, outlets, and electrical devices.

Key Features and Specifications:

• Non-Contact Operation: The device works based on capacitive coupling, detecting the electric field from an energized source without requiring direct metallic contact with the conductor, which significantly enhances safety.
• Voltage Range: It typically offers a dual-range AC voltage detection, such as 12V to 1000V AC and/or 48V to 1000V AC, which allows for testing both low-voltage control circuits and standard household wiring.
• Indicators: It signals the presence of voltage using a combination of audible (buzzer) and visual (LED light) alarms. The LED indicator may flash red.
• Distinguishing Wires: It can often distinguish between the live (hot/fire) wire and the neutral (zero) line based on the frequency or level of the alarm.
• Breakpoint Finder: It is a helpful tool for finding breaks or faults in a live circuit or cable.
• Built-in Flashlight: Includes a white LED light to allow the user to work effectively in poorly lit or dark environments.
• Design & Portability: Features a compact, pen-type design with a clip for easy carrying and pocket storage.
• Safety & Power: Operates on common batteries (often $2 \times 1.5\text{V}$ AAA batteries). It typically has an auto power-off function to conserve battery life.