Features: The LCD Readout can show the result of wiring conditions, voltage, and time required to trip a GFCI device, no need to look at a chart to understand result. It cAn detect and identify common wiring faults, ensuring electrical safety and proper functionality of GFCI receptacles, it can be used for plug security testing in homes, factories, office, or buildings. Just plugging the Sockets tester into standard outlet, and it will show the result on the screen within 3s. The auto-hold function is convenient for hard-to-reach outlets, bright LED light illuminates green and redness for easy visual indicators. This outlet checker have comfortable ergonomic, delicate. All these convenient features make testing work much easy The receptacle tester is enough to handle any working environment, more secure Specifications: Component:ABS Size:Approx.11.17x5.58cm/4.39x2.19inch Package Includes: 1Pc GFCI Outlet Tester note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.