A socket tester is a handheld electrical device used to quickly assess whether wall sockets are properly wired and working safely . They are plugged directly into a mains socket or via an attached plug connected by a lead. Specification: Model: UT07A-EU Brand: UNI-T Operating voltage: 230V Operating current : ＜18mA Operating frequency: 50Hz~60Hz Package includes: 1 x UNI-T Socket Tester UT07A-EU