Neoweb, i have just got the Wixey gauge in the UK for Ł33.90 inc delivery from a company that advertises on ebay "The Wi-Fi Antenna shop", it arrived 2 days after ordering. It needs setting to zero before you use it, I used a bubble level and managed to get it dead level (turn the Wixey gauge the opposite way to check for same reading to ensure correct 0.0 reading, thanks to Stargazers Lounge forum for that tip). I levelled my scope horizontally by eye and checked it, got 0.1 on the gauge not bad ! As far as I know you do not need to check with Polaris, I tried it between the clouds on Castor, Rigel etc and using Stellarium I was within 0.3 of a Degree and the stars were quite central in my 25mm eyepiece

Not bad, so thanks to everybody on this thread for their advice. I have fitted the degree circle to the base but have not had chance to try it yet but so far so good.
Cheers,
Onslowe