Features: Detection voltage: DC 2.4V - 30V Working current: Display: 0.28 inch LED Dimensions: 22.5 x 10 x 7mm (length x width x height) Installation hole: 23 x 10 mm Measurement rate: ≥200mS / times Accuracy: 3percent(+/- 1 word) Operating temperature: -10 - +65 Degree C Working humidity: 10-80percent Working pressure: 80-106kpa Color: This package include 5 colours Mini Digital DC Voltmeter : Red: 2.5V - 30V Yellow: 2.6V - 30V Green: 2.6V - 30V Blue: 3.2V - 30V White: 3.0V - 30V Package Including 5 Mini Digital Voltmeter(Red, Yellow, Green, Blue, White)