Just to beat this subject a little more,!
I have a F70, it has a meter, but what it also has is the ability to have 99 tones and modulated/proportional audio...Set up in the 99 tone feature, a fellow does not look at the screen, the tones tell you what the target probably is, and the proportional audio tells you how deep and big it may be, and where it is under the coil, so stabbing with a screwdriver is no problem...you can tell a rotten zinc from a fresh one, and a token from a zinc, a Q from a D, tab from a nickel, etc...if a fellow is sweeping for freshies, set up with a low sens and 99 tones, you can flat clean up targets in the 5" to surface range without looking at the screen or even pinpointing, its a machine somebody who is blind (or in the dark) could run entirely hunting heads up and audio alone. I agree that if a person has to use their eyes on a screen, its too fatigueing and takes too long. The more audio feedback and faster a guy is on retrieval cements all those sounds in a fellows internal CPU to the point of ping to pouch time is greatly shortened. A person jewelry hunting should not decide whether to dig or not, just ping, dig and move. No matter what machine you have, the faster a fellow can concentrate and acquire targets, the quicker the learning curve, and thats where tones make for some fast hunting.
gotta go hunt, Good Luck everybody!
Mud