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For what it's worth here's my TID list.
90's usually tin cans at depth, you've gotta dig it though
80-85 if it's a single signal each way, it's either a nice copper coin or copper tube/sheet maybe a buckle. If it's got a bit of a grunt could be deep iron.
70-80 smaller copper coin, lead bits or musket balls.
50-70 hammies, silver articles.
40-50 definitely worth digging, could be a small hammy.
I very rarely use the pinpoint function as the machine is so accurate, I normally use the earphones supplied with the machine.
A double ding each way usually means it's something with a hole in it, can even be a big iron washer.
A morse code kind of signal means it's pretty shallow, check the surface.
A good signal but chattery usually means coke
These are with the Q40 on Jewellery, sens anywhere from 75 upwards, I don't mind it a bit chattery because it shows where the iron is, I auto ground balance, usually in the 50's on our fields.
I know it's not the most expensive machine out there but it's one hell of a machine when used properly, you really can't go wrong for the money.
Hope this is helpful.