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1 newton meter = 0.102 kilograms of force applied to a 1 meter long lever.
Therefore, 10Nm of torque ≈ 1kg at the end of a 1m lever.
Find a 1m stick, tie 500g weight to the end, hold horizontal from the opposite end and the resulting force will get you v close to a bike wrench’s 5Nm reading. Some maths will accommodate a similar exercise with a 300mm wrench or something you can clamp to an Allen bit held by the torque wrench.
Muc-ed-off
lynx
Compare it to another wrench? Or look up how to test a torque wrench, using a fixed weight.
Not sure how to do 5nm without looking it up in a reference book.