Frequency Meter, 400 Hz AC, With TransducerCondition:* New Surplus Stock, In OEM Packaging. As Pictured.Additional Notes:* Sealed 400 Hz Frequency Meter With Remote Transducer To Convert 115 Volt 400 Hertz To 1 ma DC* Meter Movement: 1ma DC* Meter Scale: 380 To 420 Hz With 1 Hz Increments* Transducer Input: 115 Volt AC, 400 Hz* Transducer Output: 0-1 ma DC* Meter Mounting Hole Diameter: 2.1 Inch* Panel Mounted, Mounting Hardware 1ncludedAM Instrument IncMeter- Model#: 269-021, P/N: 07878-84-32716-1Transducer- Model#: 3188; P/N: 07878-84-32709