Hi boardarch, That's a very nice target ! Unfortunately I do not know of any consumer grade accelerometer which can achieve this kind of accuracy, especially over a wide temperature range. The BNO055 has built-in calibration which can typically keep the pitch and roll error <2 degrees. This is an order of magnitude higher than your requirement. With good mechanical design and smart calibration routine (not automatic like the BNO055), <0.5 degrees can be achieved at room temperature, but would require periodic manual recalibration. https://community.bosch-sensortec.com/t5/Knowledge-base/BMA4xy-accelerometer-series-design-guide/ta-p/5837 o_o
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