Maybe they have to be within 10% accuracy when they're made, or something. It sounds like it could just be an extrapolation of that 10% leeway thing that most people talk about with speed limits, or the other way around. It'd be unenforcable anyway surely - MOTs don't check it.
Maybe they have to be within 10% accuracy when they're made, or something. It sounds like it could just be an extrapolation of that 10% leeway thing that most people talk about with speed limits, or the other way around. It'd be unenforcable anyway surely - MOTs don't check it.