The UEi ATLTX is modular test lead extension wire. The test lead extension wire is compatible with the following UEi units - DL489, DL429, DL429B, DL419, DL389, DL379B, DL479, DL469, DM505, DM515, DM525, DM393, UTL291, UTLDM1, UTLDM2, UTL33T, DMEG3, IRT. The extension is also compatible with ATL1, ATL2, ATL3, ATL5, ATL6.