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My preference is the park tool one which is very expensive (but last longer).
The Lifeline one look pretty decent, word of advice is to make sure you unscrew it every time you finish using it, otherwise it'll weaken the spring inside.
http://www.wiggle.co.uk/lifeline-professional-torque-wrench/
However I'm sure @mdcc_tester have some recommendation.
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Do you have any recommendations?
If you UTFS, there's plenty of chat about what people use and recommend.
Always, buy a torque wrench, it's one of those tools that's worth buying.