Monitor your mains in one glance with the Digital 3‑in‑1 AC Ammeter, Voltmeter, and Hz 22mm LED Indicator. This compact panel device shows current (A), voltage (V), and frequency (Hz) on a bright digital display, ideal for control panels, generator setups, MCCs, and distribution boards. It fits a standard 22mm hole and installs fast with a locking nut. The unit is designed for 50/60Hz systems and provides clear readings to help you diagnose issues, balance loads, and keep your equipment safe. Built for tough environments, the front face is resistant to dust and splashes (IP65 front, model dependent). The unit supports a wide AC voltage range (e.g., 60–500VAC) and current measurement via an external CT (commonly up to 100A, variant dependent). Choose the color you prefer (red/green/blue display options on many models) and the coil/CT rating you need. Wiring is simple, and the display is easy to read even in bright panels. Features: 3‑in‑1 display: Amps, Volts, Frequency 22mm panel mount, quick install Bright LED digits, high visibility Supports external CT for higher amps IP65 front (typ.), 50/60Hz AC Specifications: Hole size: 22mm standard Voltage range: ~60–500VAC (model dependent) Current: 0–100A via CT (variant dependent) Frequency: 45–65Hz Power: Self‑powered from measured line (typ.) Uses: Generator/ATS panels MCCs and control cabinets DB boards and sub‑panels HVAC and pump panels Workshop and OEM panels Package Includes: 1 x  Led Lamp Indicator