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  I would Put The X-terra line of Detectors in the same class as some of the other brands mid to high end lines. 
 
 I do not have a considerable amount of time on these machines but I have enough to know they are easy to use, very light and can reach depths that some of the competitions high end machines cant. With the different frequencies and several coils to chose from really makes these machines capable of being used just about anywhere for all kinds of  hunting needs.
 
 
 
 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
                                                                (Below is some of the features of the X-terra detectors and comparison)
 
Description 
X-terra 705 
X-terra 505 
X-terra 305 
Weight   
2.9 lbs 
2.9 lbs 
2.9 lbs 
Batteries 
4 AA
4AA 
4AA 
Headphones   
1/4 inch 
1/4 inch 
1/4 inch 
Frequencies   
3, 7.5, 18.75 khz 
 3, 7.5, 18.75 khz 
7.5, 18.75 khz 
Search coil 
9 inch 
9 inch 
9 inch 
Interchangable coil   
yes 
yes 
yes 
Waterproof coil 
yes 
yes 
yes 
Number of search Modes 
8 
3 
3 
Threshold 
adjustable 
fixed 
fixed 
Manual ground balancing 
yes 
yes 
yes 
Automatic ground balancing   
yes 
no 
no 
Number of target Id segments 
28 
19 
12 
Depth indication 
yes 
yes 
yes 
Pinpoint mode 
yes 
yes 
yes 
Number of Audio tones 
4 and Multi (28) 
4 and Multi (19) 
3 and Multi (12) 
Special features 
  • V- flex technology
  • Iron Mask 
V-flex technology 
V-flex technology 
 
 
 
 
       (below is different targets and the numbers for each machine that correspond with that target)
                                                        
Target 
X-Terra 70    
X-Terra 50 
X-Terra 30 
Zinc Cent   
30 
30 
32 
Wheat penny 
34 36 38 
33 36 
32 36 
Indian Head Cent 
24 26 28 30 32   
24 27 30 33 
24 28 32 
Large Cent 
44 
45 
44 
Jefferson Nickel 
12 
12 
12 
Buffalo Nickel 
12 
12 
12 
V Nickel 
10 12 
9 12 
12 
Shield Nickel 
12 
12 
12 
40 % Silver Nickel 
12 14 16 
15 
12 16 
Silver Dime   
36 38 
36 
36 
Silver Quarter 
42 
42 
40 
Silver Half 
44 
45 
44 
5 Dollar Gold 
26 
27 
28 
10 Dollar Gold 
34 
33 
32 
20 Dollar Gold 
38 
36 
36