Kenny ....invest in some decent scales ... fishing scales are cheap and fairly accurate.

EG http://cgi.ebay.co.uk/BRAND-NEW-56lb-25kg-DIGITAL-SCALES-FOR-CARP-FISHING_W0QQitemZ190195456786QQihZ009QQcategoryZ72 667QQssPageNameZWDVWQQrdZ1QQcmdZViewItemhttp://cgi.ebay.co.uk/BRAND-NEW-56lb...FISHING_W0QQit emZ190195456786QQihZ009QQcategoryZ72667QQssPageNam eZWDVWQQrdZ1QQcmdZViewItem