Here is a couple of shots using my latest homemade electrodes that I've had good luck with. The TENS unit that I am using cost about $50. The glans electrode is a ring made of 18 guage copper wire. The shaft and balls electrode is made of 8 guage copper wire in the shape of figure 8 with the larger ring around the shaft and the smaller around the balls.
I think SmartStim.com • Index page recommends some units or google T.E.N.S.
WHOW! Dude! Homemmade? Either you've got a degree in electronics or a hell of a lot more balls than me.
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