Nice! Having a reed switch ready to go seems ideal and will save a lot
of faff with photodiodes and the like.
I bought this counter http://www.hobby-boards.com/store/products/Dual-Counter.html
last year (just to sit on a shelf of course). It's got two inputs and I
assume you'd just connect the reed switch between the input and 5V or
ground (I've not looked up which). Don't know whether it would need
de-bouncing - hopefully not - so minimal electronics skills needed.
The counter is 1-wire so you could then use a 1-wire to USB adaptor and
something like OWFS to collect readings - shouldn't take long to set up.
You'd need to run a 1-wire/cat 5 from your meter housing to a
PC/NAS/RasPi/etc running OWFS though.
HTH
Simon
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