My experience with HF electronics - they won't last long and can't take much in the way of hard useage. I wouldn't buy one of theirs. I use a Craftsman 6" English, but its only a dial caliper (bought it a long time ago). I have more useage for English than one thats metric. Calculator is all that's needed to go metric for mine.

Here's a quality one -

http://www.sears.com/shc/s/p_10153_12605_00948261000P


Note that it will do both English and metric. Compare accuracy with the Boca (if you can find specs) so you understand what the extra cost goes for.