Goron
Who gives a monkeys what its called!, its accurate to half an inch - I have vigorously tested it (and therefore does its job), is quicker and is more professional than a tape measure.
Didnt realise that was a problem :

. Surely you've got £9.99 spare to try it? - you'll be surprised

Kev
p.s. just got back from quoting with it, did it SO much quicker, and the custy was well impressed - cos she said so!