Thank you very much archie!!! Just goes to show that you don't HAVE to buy the most expensive stuff all the time. I will be using it every time so I guess that is one thing I do need to take into account. What's your personal favourite type of growing medium and why?i cheaped out and got a lil yellow ph pen on ebay £6 but i did spend £25 on various solutions for the pen.may need testing and calibrated more often than an expensive pen,but 3 years on its still working.
but if testing every watering or if not growing in soil,then a better pen may be better value in the long run.
good luck.
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