Aofan Auto Voltmeter DC12V 24V with LED Digital Display, Round Mini Waterproof,for Car Motorcycle Truck (red)

【1】Precision Monitoring: Real-time 3-digit LED display accurately measures 5-30V DC voltage levels, with bright red backlight for clear visibility day and night 【2】Universal Compatibility: Works with 12V/24V electrical systems in cars, motorcycles, trucks, RVs, boats, ATVs, and other recreational vehicles 【3】Durable Construction: IP65 waterproof rating with corrosion-resistant housing and shockproof design for reliable performance in harsh conditions 【4】Easy Installation: Fits standard 29mm dashboard holes, secured by nylon locking ring - no special tools required 【5】Battery Protection: Helps prevent overcharge/discharge by monitoring charging status and detecting voltage irregularities