Chesapeake Black 2 Voltmeter 10-16 VDCPerimeter-lighted Black dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed 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 lensPerimeter lighted back light12 VDC negative groundCan be adapted for 24 VDC systemsFac