Amazfit GTR comes with 5ATM certification, which means it is waterproof up to a depth of 50 meters.
XDA Senior Member anox recently released an altimeter application for the Amazfit Pace, AmazfitStratos, and Amazfit Verge smartwatches. Source: PaceUp is an altimeter for the Amazfit Pace, Stratos, and Verge
FCC ID application submitted by Anhui Huami Information Technology Co.,Ltd. for AMAZFIT PACE for FCC ID 2AC8UA1612 ( 2AC8U A1612 ) Frequency, Reports, Images, and more. Source: FCC ID 2AC8UA1612 AMAZFIT PACE by Anhui Huami Information Technology Co.,Ltd.