Description: Display the DC voltage and current simultaneously by LED digital tube. Including one independent small precise current regulator with a rear cover. Wide measurement voltage and current range. No need to add power supply and AC regulator . Widely used in audio amplifier, power distribution box, distribution cabinet, regulators, teaching aids, household small distribution box, etc. Specification: Material: Plastic Power Supply: DC 3.5-28V Measurement accuracy: ±(0.3%+2 digit) Display: 0.28 "dual 4 digital tube. Refresh rate: about 200ms/time Display color: Red, Green Operation temperature:-10 degrees~65 degrees Voltmeter range: DC 0.00-33.00V （resolution 0.01V） Ammeter range: DC 0-3.000A （resolution 0.001A） Size: Approx. 48x 29x 21mm/ 1.89x 1.14x 0.83inch Package Includes: 1 Piece Digital Voltmeter Ammeter(2 Pack) Note: Please allow 1-3cm error due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item, please understand.