How are people measuring their bonus dose for accuracy? I tried the hard twist at the end of my first 2.5 pen, but I couldn't be sure how much was in there. So I extracted with a syringe and it was 0.4ml. I only had larger syringes and didn't much fancy the pain of those so threw it away (in hindsight I realise I should have got smaller needles).
But I'm curious, for those of you using the hard twist - once the mechanism is broken how can you know how much is going in? I'd prefer to do the hard twist as it's simpler, but I don't like not knowing exactly the dose I'm injecting.