A new calibration test for the Apple Watch aims to significantly improve the accuracy of its fitness tracking data. By completing a 20-minute calibration exercise, users can reportedly increase the precision of distance, pace, and calorie calculations by up to 80%. This test is presented as a vital solution for users experiencing inaccuracies in their current workout metrics. AI
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RANK_REASON The item describes a new feature or test for an existing consumer product, fitting the 'tool' category.