Modify to suit your own neeeds of course.
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I question why you've indicated that coins can be grouped by size - small/medium/large, without mentioning what metal they're made from. Silver threepences read pretty high up the scale, despite being tiny. Post-2012 10p coins are medium/large, but read as iron. I assume mention of gold coins is down to beginners optimism?
Having said that, once you've filled in a lot of the blanks, it should give you some useful idea about what goes on. It may show that 'low conductors' are hard to find on the wet beach, for example. I assume most detectorists tend to build up this chart in their head eventually.
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Was it useful? - maybe, even if it was to reinforce learning the machine.
Was it a waste of time? no, it's all helps to learn a machine, but it will drive you mad trying to put exact science in to it. I gave up once I was happy I could recognise a target 70ish% of the time.
Do I do it with the Deus? nope - I just dig and learn
They told me I’d never be any good at poetry, because I’m dyslexic, but so far I’ve made 3 jugs and a vase.
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Perhaps in a specific location where the ground conditions are liable to remain constant there could be some gain. I think in general detecting, it would soon be dispensed with for the reasons given by this and other replies.
It shows you are serious about improving your detecting knowledge and skills though
I am in UK despite the spelling of Jewellery (that bit was taken from the Garrett 400i Manual).
As I spent the time making it- I thought it would be nice to sharre it. You don't have to use it if you so wish of course.
All the best