0V-30V 3 Wire DC Voltmeter Terminal 0.56 Inch LED Digital Voltmeter Accessories Reverse Connection Protection 1. With reverse protection, reverse not burned 2. Low cost, high precision to meet most of the application requirements 3. Low startup voltage, red as low as 4.5V, green as low as 5V, blue as low as 5V 4. Input voltage up to DC30V, ( note: input voltage higher than 30V may be permanently damaged ) Technical parameters: 1. Measuring range: 0V-30V 2. Input impedance: greater than 100K ohms 3. Refresh speed: about 300mstime 4. Operating temperature: -10-65 degrees Celsius 5. Power supply range: red DC4.5-30V, green DC4.7-30V, blue DC5-30V 6. Allowable error: about 1 percent, greater than or equal to 10V error of about 0.3V, less than 10V error of about 0.1V 7. Operating current: red less than 23mA, green less than 18mA, blue less than 13mA 8. Display mode: three 0.56-inch LED digital tube 9. Display color: red, green, blue 10. Length of lead wire: 20 cm 11. Weight: about 19 g 12. Size: about 4.8 x 2.9 x 2.2 cm, mounting holes about 4.6 x 2.7 cm