50-0-50 Amp DC Analog Panel Meter, 2.5 InchProduct Details:Linear Scale 50 – 0 – 50 Amp DC with 2 Amp DivisionsShunt Required (NOT Included)Movement: 50 mVMeters Reads Both Charge – Discharge CurrentMeter Input: Screw TerminalsPanel Cutout Dimensions: 2.14″Dimensions: ~2.99″ (W) x 2.27″ (H) x Overall Depth: 2.2″Mounting Studs are 1.88″ Center to CenterMeter Needs 50 Amp External ShuntBocatech, IncBTMT3-50-50A