Low cost, high accuracy to meet most application requirements. High precision with reverse polarity protection; reverse connection does not cause damage. Measuring range: 0.00V–30.0V Power range: Red DC 4.50–30.0V, Green DC 4.70–30.0V, Blue DC 5.00–30.0V Maximum input: DC 30.0V. Note: Input voltage above 30V may cause permanent damage. Tolerance: ±1%; error ≥10V is ±0.3V; error <10V is less than ±0.10V Input impedance: Greater than 100KΩ Current: Red less than 23mA, Green less than 18mA, Blue less than 13mA Refresh rate: Approximately 300ms Display: Three 0.36-inch LED digital tube Display color: Red, green, blue optional Lead length: 15cm Including installation ear length: 33mm Mounting holes: Pitch: 28mm, Aperture: 2.8mm Working temperature: -10°C to 65°C Test voltage positive: White wire Operating voltage positive: Red wire Common negative: Black wire Note: Different colors have different measuring voltage ranges; please choose accordingly. Installation guide not included. Please verify the item meets your requirements before use. Product may vary slightly due to different batches; minor differences in appearance or color may occur and do not affect functionality. Color: As shown in photo Material: Plastic Package Contents: 10 x 3-Wire Mini Digital Voltmeter Only the above package content; other items not included. Note: Lighting and display settings may cause slight color differences between the image and actual item. Measurement error allowed: ±1–3cm.