Hey
@Nabzter,
If it's any help, after a bit of research I purchased the following from somewhere on E-bay.
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Make sure it has the above features and comes with a good solid base, as there are a lot inferior models out there, also I would advise against high magnification ones, although that may sound appealing (they require a very firm stand to be able to close focus, and these don't have that - and totally over the top for our requirements) 100 to 300 magnification is spot on... but get the 5 mp version.
This one cost me about £42.00... I thought the potential increase in yield over just one grow should more than pay for itself. Let alone trying to be able to spot problems (this is an outdoor plant of mine that was being eaten).
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And you get nice pics.... Bonus.
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Money well spent.... in my book!