Line Voltage Monitor Hughes Auto DVM1221 Provides A Continuous And Accurate Reading Of AC Line Voltage; Plug In Wall Socket; Measures Voltage Between 90 To 132 Volt AC; Digital DisplayLine Voltage Monitor; Provides A Continuous And Accurate Reading Of AC Line Voltage; Plug In Wall Socket; Measures Voltage Between 90 To 132 Volt AC; Digital Display; Can Also Be Used As A Night LightHughes Autoformers have provided high quality solutions to RV low voltage for 20 years. Proudly made in the USA. Used For: Provides A Continuous And Accurate Reading Of AC Line Voltage Type: Plug In Wall Socket Display Type: Digital Control Voltage: 90 To