ITEM NAME:Non-contact Tester Pen With Voltage Power Detector Probe Sensor Test Pencil Descriptio n Description.Frequency Range: 50 to 500 Hz5. Compact, safety, & easy to carry. Output Current : 3.1A. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted. Frequency Range: 50 to 500 Hz.