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[Webby the Bear]

OOF wheel nut torquing: official advice. . . .

Buy impact gun with at least 400nm of tightening force.
Blast nuts 'til you're satisfied they'll never come off again.

Admin please add to the recent tyre advice thread I posted 

[BazaJT]

Always fancied having a torque wrench but couldn't justify cost versus usage angle.Then a few years ago was going round a local car boot sale and there was one up for sale,so I asked the woman how much it was and she didn't even know what it was!!Turns out it was her sons so I got it for £3!!Damn great tool it is too,both in size and uses I've since put it to!!

[Webby the Bear]

How often do they need calibrating?

Got two t. Wrenches and often wondered how far out if any they are.

Haven't used one in a while to be honest 

[Diamond Black Geezer]

Not perhaps much of an answer, but got my brand new (calibrated and made in Britain) Halfords torque wrenches for Birthday, and compared them with my old man's donkeys years old 'bendy bar' type. Draper if memory serves. Which has been abused, knocked, bent, clouted and must be about 25 years old at least. We pretty much decided that it was between 5-10% out at the very most, which considering the age and life it's led we thought wasn't bad.

So I'd say - 'depends on the abuse' etc, and depends how precise you want to be, and what you consider to be 'far out'; but if I regularly used a tool and after 30 years found it to be maybe 5% 'wrong' (so I'll be in my 60s by such time) I'd be pretty happy with that.