Electronic meters are superior, sure, but are you prepared for the
cost? I haven't seen one unit that monitors all those things, (not to
say it doesn't exist, due to the money involved I haven't researched
them deeply) but to give you an idea of the kind of money you're
looking at, a decent PH monitor will run you 75 US dollars (about 57
Euros) and up. From my observations, most aquaria-related products
are much more expensive in the UK.

--
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Billy
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"Gary" wrote in message
.uk...
| I was wondering if you guys could recommend a probe or meter which
tests the
| water for the following:
|
| - Nitrite
| - Nitrate
| - Ammonia
| - PH
|