Halo Dungeon Scaling

86:  A muscular marine (1194470)
     A short yellow-armoured creature (111874)
     A blue-armoured elite (1452680)
90:  A muscular marine (1540935)
     A short yellow-armoured creature (1336970)
     A blue-armoured elite (1776550)
100: A muscular marine (3810160)
     A technician in an orange jump-suit(4155772) 
     A short yellow-armoured creature (3409370)
     A blue-armoured elite (4256915)
106: A technician in an orange jump-suit (4893917)
     A short marine (4825174)
     A short yellow-armoured creature (4758074)
     A blue-armoured elite (5539072)
120: A technician in an orange jump-suit (5593905)
     A short yellow-armoured creature (5108625)
     A blue-armoured elite (6647075)
135: A technician in an orange jump-suit (11638770)
     A short yellow-armoured creature (11422030)
     A blue-armoured elite (12676995)
140: A technician in an orange jump-suit (12436215)
     A short yellow-armoured creature (12837400)
     A blue-armoured elite (15134185)

There are two versions of the other available as a quest reward. A shiny "unique" version (which has bop copies sometimes) and a "jury rigged" base version. Both versions have some AC and SMD while the shiny version also has some DR as well as a fun bonus if you rescue Cortana. Both items scale linearly with scaler level.