ITEM NAME:5pcs Mini Digital DC Voltmeter 0.28 Inch Two-Wire 2.5V-30V Mini Digital DC V8E9 5pcs Mini Digital DC Voltmeter 0.28 Inch Two-Wire 2.5V-30V Mini Digital DC V8E9 Adjustable voltage resistance,Turn the buck voltage clockwise can directly work with 5v, 9v, 12v, 24v. 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 Detection voltage: DC 2.4V 30V. Working current: 30mA. Measurement rate: Greater than equal200mS / times. Operating temperature: -10 +65 Celsius .Installation hole: 23 x 10 mm. Display: 0.28 inch LED Dimensions: 31 x 12.0 x 9mm (length x width x height) Accuracy: 0.3%(+/- 1 word) Working humidity: 10~80% Working pressure: 80~106kpa Color: photo colour Material: plastic Package Including: 5 x Mini Digital Voltmeter(Red, Yellow, Green, Blue, White) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Working current: 30mA. Installation hole: 23 x 10 mm. Working humidity: 10~80%.