I really liked the ruler idea. I have definitely picked up typos when I hear my book read. I've also heard (can't remember where) that changing the font colour can be helpful - although possibly sore on the eyes!
Hi Emily - Thanks for that. I always use the ruler one. It's so easy to apply and works really well. I haven't tried changing font colours, but that could work well depending on the colour. I'll have to give it a try. Thanks for the suggestion.