Why did whites limit the depth indicator to 13 ins???? I could hear the target loud and clear but when I pinpointed no depth indication. After removing 5 or so ins of soil. I was able to get a depth reading. I decided to airtest of some coins and the button in trigger lock same thing get more than 13 ins and no reading. I know it's not important but it's strange the darn v machine is deep also picked up a silver 36 Merc at 11 ins loving the v machine. HH to all c t