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White's TDI For Coin Detecting?

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The TDI Pro is basically the same unit as the standard TDI and appears to have officially replaced it. The Pro is set up with dual ground balance controls and a volume control to get a finer tune and a better threshold. But those features were mainly aimed at it being sold in Australia along with a plain 12" round mono instead of the 12" Dual Field mono. The Dual Field is a bit too hot for Aussie ground. The bottom line is it gave White's a unit they could sell in Australia as the original TDI was not quite up to the task there. White's offered both the TDI and TDI Pro for some time with only a minimal price difference but it really makes no sense to make both. I would not be surprised if some dealers still have some standard TDI models. The main difference right now is the cut the Pro back to one battery and so if you can find a bit older unit new on somebodies shelf right now you may still be able to get two batteries with the unit. The TDI sucks up a 14.4V rechargeable battery pack in a day so having the backup is nice.

The TDI SL with a 12V battery gets sucked up in 4-5 hours! You do not want to use AA batteries in it unless you own a battery factory. It comes with one rechargeable pack but figure on buying another one right off. One for the first half of the day and one for the second half of the day.

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I meant the Detector Pro PI machines that have the electronics in the head phones.

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The DetectorPro units do not ground balance and so offer no discrimination capability, which is a side effect of the ground balance circuit. If you are looking for bottom dollar in a ground balancing PI that would be the Garrett Infinium.

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