Tesoro LST, Tejon, Whites GMT, TreasureMaster PI 3000, Falcon MD20, Vibraprobe, Garrett Pro Pointer AT.
Re: 1921-D Morgan
The hair right above the ear on the obverse, and the breast feathers on the eagle, on the reverse are the two high points to look at first. Also if it has the orginal mint luster is a deciding factor. I collect and love Morgans, and I think that it is a great looking coin that you have. Get a book and try grading it yourself, then subtract two levels, and that is probably realistically what it is. This way you won't be disappointed, but it's always a nice surprise if it grades higher professionally.