Obtaining Unusual Angles with Precision

I see that iGaging has a new digital miter gauge out:https://taytools.com/products/igaging-ez-digital-miter-gauge-18-or-24-new

It's $100, so pretty affordable. However it suffers from the typical digital accuracy flaw:

Resolution: 0.05°
Accuracy: 0.2°

It would be interesting to know real-world performance of these digital angle thingies. For instance, if you calibrate at 90º, is it resolution accurate to return to that 90º mark, and it's just that setting, say, 40º might be off by 0.2º? I've seen digital levels that claim a higher accuracy at 0º and 90º than they have for odd angles in-between.
 
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