Euro Black 2 Voltmeter 20-32 V Perimeter-lighted Black dial with bold White graphics, Black aluminum bezel, contoured White pointer and flat glass lens. A voltmeter indicates the battery voltage and the general condition of the battery charging system. The meter requires no warm-up and indicates voltage changes instantly.2 - Hole Size 2.0625 53mmSpecificationsAnti-scratch glass lensPlastic Cases for corrosion resistance and long lifePerimeter-lighted Black dialCan be adapted for 24 VDC systemsFa