Minelab x-terra manual X-Terra 30 has 12 segments, X-Terra 50 has 18 segments

29

30

1 ferrous	11 non-ferrous
	The X-Terra 30 has 12 segments.
	The target IDs range from -4 up to 44, increasing in steps of 4.

50

3 ferrous	15 non-ferrous
	The X-Terra 50 has 18 segments.
	The target IDs range from -9 to 45, increasing in steps of 3.

The more segments available, the more separate target IDs available.