Since 1981, Valterra Products, has been a leading supplier of brand name product lines to the RV, pool and spa, and plumbing industries.• Used For: AC Line Voltage• Type: Plug In Wall Socket• Display Type: Digital Display• Control Voltage: 90 To 132 Volt Accurate Digital Display Ensure Proper Power In The RV, Boat, Home Or Office | Valterra Line Voltage Monitor