Features: _x000D_ 1. Made of high quality material, durable and long service life. _x000D_ 2. This accuracy voltmeter has a "core" of 0.025% resolution to make sure sufficient margin, it has high accuracy _x000D_ 3. No need to supply power separately, use the power supply under test directly _x000D_ 4. Low startup voltage, blue shows a minimum of 3.0V _x000D_ 5. It has reverse connection protecting function and will not burn when connected. _x000D_ _x000D_ Specification: _x000D_ Condition: 100% Brand New _x000D_ Measuring Range: DC3.0-30.0V _x000D_ Power Supply Range: No Need to Supply Power Separately, Use the Power Supply Under Test Directly _x000D_ Allowable Error: 0.1% _x000D_ Input Impedance > 100K Ohms _x000D_ Operating Current: < 18mA _x000D_ Refresh Rate: About 300ms Once _x000D_ Display Mode: Three 0.36'' LED Digital Tube _x000D_ Lead Length: Approx. 15cm / 5.9in _x000D_ Size: Approx. 23 * 15 * 10mm / 0.9 * 0.6 * 0.4in(length x width x thickness) (Without Mounting Ears); With Mounting Ears Length: 33mm _x000D_ Mounting Hole Spacing: 28mm, Aperture: 2.8mm _x000D_ Working Temperature: -10- 65 _x000D_ _x000D_ Package List: _x000D_ 5 * Digital Display Voltage Gauges