Features: Detection voltage: DC 2.4V ~ 30VWorking current: <30mADisplay: 0.28 inch LEDDimensions: 22.5 × 10 × 7mm (length x width x height)Installation hole: 23 × 10 mmMeasurement rate: ≥200mS / timesAccuracy: 3%(+/- 1 word)Operating temperature: -10 ~ +65 ℃Working humidity: 10~80%Working pressure: 80~106kpa Color: This package include 5 colours Mini Digital DC Voltmeter :Red: 2.5V - 30VYellow: 2.6V - 30VGreen: 2.6V - 30VBlue: 3.2V - 30VWhite: 3.0V - 30V Package Including 5 * Mini Digital Voltmeter(Red, Yellow, Green, Blue, White)