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Description1, 'measuring range: red DC4.50-30.0V, green DC4.70-30.0V, blue DC5.00-30.0V2, the power supply range: no additional power supply, the use of the measured voltage as a direct power, the same as above3, the maximum input: DC30.0V. Note: Input voltage higher than 30V may be permanently damaged!4, the allowable error: ± 1%; greater than or equal to 10V when the error is ± 0.3V; less than 10V error ± 0.105, the input impedance:> 100KΩ6, the working current: red <23mA, green <18mA, blue <13mA7, refresh rate: about 300mS once8, display: three "0.56" LED digital tube9, display color: red, green, blue10, lead length: 20cm11, Dimensions: 48 x 29 x 22 mm12, hole size: 46 x 27 mm13, net weight: 18g14, the working temperature: -20 ℃ ~ 65 ℃