On 10/09/2012 20:44, geoff wrote:
In message , Rick Hughes
writes
I bought a pH meter which is aimed at gardeners ...
http://www.amazon.co.uk/Gardman-Soil...001P3XAEE/ref=
sr_1_3?ie=UTF8&qid=1347222580&sr=8-3

I thought I could also use it on liquids ... but I have serious doubt
it is reading acidity correctly.
Is there a simple way of testing ?

In water it read 7 .. (so OK there) ... I tried in in a bottle of
white vinegar with is rated at 5% acidity it reads pH 6

Is there a simple home way of testing calibration ?

You can get buffer solutions of (IIRC) pH 4.7 and 11 which are the
standards used for calibration




Thnx .... found some on ebay