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If the question really is ' how can I check the accuracy' and NOT 'can I use wrenches out of calibration' then It's just physics. Tighten any nut to a measurable value (5Nm for example, can do same theory in other units of course) then measure your torque wrench length (e.g. 0.5m) then hang a bottle of water of known volume off the end (e.g. 1L = 1kg = ~10N) and the product is the answer. 10x 0.5 = 5Nm. Adjust the water fill lower or higher until the nut moves or doesn't move. There is your answer.
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