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Thank you fo the advice and if you knew me you would know the answer would not be that easy.I don't believe a laser will do it as they don't go round corners. And a small level will not do it as although the reading is accurate it is too localised. DannyS even has a device that you can buy for a very modest sum that will show it to you on a scale.The problem is the curve and using stepping blocks and a 1 metre long straightedge with a spirit levl is pretty simple and roughly correct. But again the length will not be quite right unless the straight edge's length is the same as the length of the gradient being measured. So in my opinion a curved straightedge of the correct length may do the job.Using a jigsaw (saber saw) you measure out 1 metre length of plywood of roughly the ciorrect curve, cut a 4 cm wide length and use this as a straight edge. The idea of using stepping blocks and a spirit level you will get to the right conclusion. a secondary stepping block of half the size of the main one to  be placed under the centre, will greatly assist stability and accuracy. I am also looking at using flextrack or similar, bent to the right curve as wel,l for the straightedge.If you use a 1 metre length straight edge, then the stepping blocks size in centimetres will be the same as the %. a 2 cm rise in a metre will be 2 % and a 1 cm will be 1 %.Now getting on to converting from % gradient to degrees, for the likes of me one is pretty close to the other but if you must; multiply the % by 1.1 and it will come to very close to the degrees. I know this isn't 100 % but for practical purposes it should work.Rgds Ian  PS, I have not actualy done this and i was wondering what others thought?
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