10 pieces of compact green 22mm round digital voltmeters for AC systems — clear LED readout and reliable monitoring for panel, equipment, and project use. Key benefits Instant, ataglance voltage monitoring: green LED digital display shows AC voltage in the 20–500V range so you can verify mains and equipment supply quickly. Multiple meters in one pack: 10 identical units make it simple to outfit several panels, machines, or test stations without sourcing individual meters. Spaceefficient and visible: round 22mm bezel with a small 30x30mm footprint fits tight panels while keeping readings visible. What it does and why you need it Continuously measures AC voltage from 20V to 500V to help detect undervoltage, overvoltage, or supply interruptions before they damage equipment. Acts as a dedicated visual indicator for power presence and basic system health — useful whenever fast verification of AC voltage is required. Saves time for technicians and hobbyists by providing immediate, unambiguous voltage information without connecting separate tools. Key attributes Quantity: 10 pieces per set for consistent deployment across multiple locations. Display color: green LED digital indicator for easy visibility. Form factor: round 22mm bezel; compact 30x30mm module size suitable for panel mounting or small enclosures. Measurement range: AC voltage 20–500V (designed for AC monitoring). Function: digital voltmeter / voltage tester / power LED indicator. Compatibility and performance notes Intended for AC voltage systems within the specified 20–500V range. Use in applications that require AC reading and visual indication. Compact design is suited to spaceconstrained panels and equipment fronts. Typical applications Industrial control panels: install multiple meters to monitor line voltages across different circuits or machines. Electrical distribution and switchboards: mount on distribution panels to display incoming mains or subcircuit voltages at a glance. DIY and workshop projects: use in custom enclosures, power supplies, or lab setups to provide continuous voltage feedback. What's included 10 x green 22mm round digital AC voltmeter modules (20–500V), each with a 30x30mm compact module size and integrated LED voltage display. Installation and usage tips Mount on a compatible panel or enclosure using the round bezel and compact module footprint. Confirm wiring to AC supply follows local electrical codes and safety practices; designed specifically for AC voltage monitoring. Package is ideal when you need multiple reliable visual AC voltage indicators for panels, machinery, or multiple project locations.