Features: Waterproof round LED digital voltmeter ensures accurate DC4-100V voltage monitoring, for outdoor durability and reliable performances in wet conditions. Featuring circular design and tool less installation, this plastic housed voltage meter integrates seamlessly into panel while delivering clear LED numerical readings. Ideal for DIY enthusiasts, marine technicians, and motorcycle maintenance professional requiring precise electrical system diagnostics. Perfectly suited for marine equipment, outdoor power systems, and automotive applications exposedly to rain, or splashing water. The plastic construction and wide voltage detection ranging make this meter a must having for realtime battery monitoring and electrical safety. Specifications: Component:Plastic Size:Approx.33x19mm Color:Red/Green/Blue Working voltage: DC4V-100V Detection voltage: DC4V-100V Operating current: <20mA Allowable error: ±1% Line length: 50cm Opening size: 30mm diameter Net weight of product: 20g Working temperature: -10℃~65℃ Installation method: nut type installation Package Includes: 1pcs Voltage Monitor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.