Building a pinpointer/small pulse metal detector?

[Leopard11]

I have this electronic device my physical therapy gave me called a TENS unit(see wikipedia for the basics). I ended up with an infection in my lower leg so im battling that for 8-12 weeks and was told to stop using the unit. It cost me nothing so was wondering if it could be converted to some type of detector. It consists of 2 channels that each have 2 electrodes that sends pulses of 1-150hz each electrode covers 1-300us. Any tech people know if I can utilize this in metal detecting by converting it somehow or any other useful device. Basically it was free so no loss if things go bad.

 

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[woof!]

TENS unit cannot be converted to anything else other than "maybe?" a worm shocker.

--Dave J.