If I remember correctly it was the acurasy that makes this gauge cheap...but I can't remember exactly. I remember the last post about this gauge and something about the acurasy but that's about all
If you purhcase the gauge adriankeith do a review and give us your feed back, I'd love to hear your feed back on it and yes like jshillin said it would be great if you could compare it to another gauge.
Oh if you go a head and purchase it make sure you can get your money back, you never know that's all.