ml138To record a 12-lead ECG with an FE238 Octal Bio amp or ML138 Octal Bio amp the following items are required in addition to the LabChart software, PowerLab, and amplifier:. MLAC29100 Patents (Medical) associated with ML138. Login to view more data. 100 Deals associated with ML138. Login to view more data. R&D Status. 10 top R&D records. Login. to view more data.