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I had a bit of measuring spree with mine to try it out. I was getting some slightly unexpected and inconsistent results. I'm not sure I'd trust it to 0.2mm to be honest.
AlexD-
One of the differences between cheap and expensive digital calipers is the speed at which you can move the jaws and still get reliable results. I have one of the Aldi ones as well as a very old digimatic whose display is going having been subject to some very strong magnetic fields. The measurements compare very well between them, in the region of a couple of hundredths of a millimetre which is in the region of operator "feel".
freezing77
Can the cheap ones tell the difference between 27.2 and 27.0 seat post or 25.4/26 bars.
It's this kinda job I need generally, where there are two 'standard' diameters less than 1mm apart.
I have about every size seat post clamp in my spares box. Next time I need a new clamp you can guarantee I won't have the right size and when I order one, the first one won't fit too...