ml138Rollway® ML138 100 Cylindrical Round Bore Unmounted Radial Roller Bearing, 190 mm Dia Bore, 300 mm OD, 2 Rows, 46 mm W, 357907 N Dynamic525414 N Static LoadTo 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:. MLAC29