ITEM NAME:1AC-D Digital Electrical Socket Wall Power Outlet Measure Voltage Instruments 1AC-D Digital Electrical Socket Wall Power Outlet Measure Voltage Instruments a.imagelink a:hover.imagelink {color:#000000;.Ideal design for testing power cables, circuit breakers, wall sockets and so on. DIY Supplies :Circuit breakers, Wall sockets. Frequency Range: 50 to 500 Hz. Display Type :Digital. Due to the difference between different monitors, the picture may not reflect the actual color of the item.