I had a Hanna ph meter for a few years and it has finally given up. But I am not prepared to pay a high price for one. I found this one on ebay. Is this any good.
http://cgi.ebay.co.uk/NEW-Digital-p...7740844333QQcategoryZ3212QQrdZ1QQcmdZViewItem
http://cgi.ebay.co.uk/NEW-Digital-p...7740844333QQcategoryZ3212QQrdZ1QQcmdZViewItem