carlb40
Established Member
Or make your own.Random Orbital Bob":3ch2dvqm said:Aye.....I spose its because other than invest in very expensive industrial measurement equipment there is no alternative.
http://www.google.co.uk/imgres?client=f ... =0&ndsp=47
Also this and the page contains a link to a PDF from Lennox
http://www.google.co.uk/url?sa=i&rct=j& ... 7511544135