Here is a list of Etrac VDI numbers. Hope this helps. Those 12-35's to 38's will be zinc pennies. 12-13 will be a nickel, 12-44-45 will most likely be a dime or a high end wheat, 12-43 can be a low end wheat, there are many factors, temp, soil, etc. Hope you can get some help from the list. Use the stock coin program and go to Goes4Ever website and use his settings, and you will do fine.
http://goes4ever.mymdforum.com/
US Coins Etrac
Target Ferrous Conductivity
US Bust Half Cent 12 38-42
US classic head Half Cent 12 40-42
US flowing hair Large Cent 12 46
US Bust Large Cent 12 46
US Classic Head Large Cent 12 46
US Coronet head Large cent 11 46
US Braided hair large cent 11 47
US flying Eagle cent 12 20-24
US CU/NI indian head cent 12 22-23
US Bronze indian head cent 12 34-35
US wheat Cent 12 40-42
US Memorial cent bronze 12 43-44
US Memorial cent Zinc 12 37
US two cent 12 40
US three cent silver 12 28-32
US 3 cent cu/ni 12 5-Apr
US nickel shield 12 13-Dec
US Nickel V 12 13-14
US Nickel buffalo 12 13-14
US Nickel Jefferson War Nickel 12 14-15
US Jefferson Nickel 12 13-14
US silver half dime Seated 12 34-39
US Silver dime Bust 12 43
US silver Dime seated 13 45-46
US silver dime barber 13 45-46
US Silver Dime mercury 13-Dec 44-46
US silver dime Rosie 13 46
US clad dime 12 44
US seated quarter 12 46
US Barber quarter 12 47
US standing Liberty quarter 12 47
US Washington silver quarter 11 47
US clad quarter 12 47
US seated half 11 46
US Barber Half 11-Oct 46
US Walking Liberty Half 11-Sep 44-46
US Clad Half 12 47
US Silver dollar Morgan 1 40-41
US Silver Peace Dollar 1 40-41
US gold 1 dollar 12-Nov 11
US gold 2.5 dollar 12 22
US gold 5 dollar 12 31
US gold 10 dollar 12 38
US gold 20 dollar 13 44
spanish half reale cobb 11 40
spanish half reale milled 12 37-40
spanish 1 reale milled 12 44-46
spanish 2 reale milled 12 46
Junk Targets Etrac
ferrous conductivity
round tab whole med 12 23
round tab whole large 12 25
round tab tab only 12 11
round tab with no tab 12 26
square tab new type soda can 12 18
square tab large 12 27
Aluminum screw cap 12 38
crown cap steel all over 13-Dec
aluminum dog rabies tag 12 40
Aluminum rivet end 3/8 inch 12 36
22 short casing on end 12 16
22 short casing on side 12 6
22 long casing on end 12 14
22 long casing on side 12 8
22 long rifle casing on end 12 26
22 long rifle casing on side 12 19
low brass shotgun shell 12 gauge on end 13 32
low brass shotgun shell 12 gauge on side 13 14
med brass shotgun shell 12 gauge on end 13 32
med brass shotgun shell 12 gauge on side 13 14
long brass shotgun shell 12 gauge on end 12 28
long brass shotgun shell 12 gauge on side 12 10
Relics Etrac
Ferrous Conductivity
Sword Belt Plate Brass 11-Oct 46-47
US Belt Plate 13-Dec 45-46
US Box Plate 13-Dec 45-46
Millitia Wreath 12 46-47
Eagle Breast Plate 13 45-46
snake buckle snake only 12 27-28
Silver ID badge 12 41
Shako side plate button 12 35
Sharpes 54 Cal dove tail 12 33-34
Williams Cleaner type II 12 30
69 cal minnie 12 34-35
58 cal minnie 12 34
Coat flat button 12 35-36
Vest Flat button 12 31
cuff flat button 12 28
Coat Staff 12 34-35
Coat Eagle 12 30-31
School Staff coat 12 37
cuff US staff 12 17
NY staff cuff 12 15
Coat US Staff 12 29
VA Staff coat 12 37
Cuff Eagle D 12 28
SC vest 12 32
Republican Blues Coat 12 39
LA Coat 12 38
HMA Cuff 12 33
SC Coat 12 36
SC Coat #2 12 24
Cuff CS I tin back 12 14
1812 Pewter 10th rgt 12 5
1812 Pewter Script I 12 12
Colonial Shoe Buckles 13-Dec 46-47