Depending on Units first column format, either
(if text)
=VLOOKUP(MID(A4,MIN(FIND({0,1,2,3,4,5,6,7,8,9},A4&"0123456789")),1),Units,2,FALSE)
Or (if number)
=VLOOKUP(0+MID(A4,MIN(FIND({0,1,2,3,4,5,6,7,8,9},A4&"0123456789")),1),Units,2,FALSE)
Hope this helps
M.