... 220V transmitter 1. Range of usingGTL-610/620 Cable Route Tester researched for meeting the need of cable route & depth ... and fault finding. It is a new type tester. GTL-610 Transmitter Features 1.Output power: under load ... for BF receiver, AM output suitable for directly amplified multi-voltage detection receiver. 4.Automatic overheat & overload protection, continuous operation ...