VOLTMETRU + AMPERMETRU 100v 0-50A, Working voltage:4.5-30V DC Note: The maximum working voltagevoltage can not exceed 30V, otherwise there is the danger of burning Working current:≤20mA Display: 0.28" Two color blue and red Measuring range: DC 0-100V 0-50A Refresh rate: ≥100mS / times Measure accuracy: 1% (± 1 digit) Operating temperature: -15 to 70° c