55-65 Hz AC, Analog Frequency Panel MeterDirect Read Frequency with Transducer Interface Board Mounted on MeterVoltage: 110 Volt ACMeter Scale has 0.5 Hz DivisionsMeter Accuracy +/- 2% Full ScaleMeter Scale has 90 DegreeArcRectangular Panel Meter Mounts in 2.14″ Diameter Round Hole.Dimensions: 2.75″ (W)x 2.375″ (H)x Overall Depth: 2.375″Mounting Studs are 1.88″ Center to Center Horizontal & VerticalMeter Input: Screw TerminalsIncludes: Mounting HardwareZero Adjustment on FrontBocatechBT2ACW41Y