Not all fitness trackers can hang out in the deep end. If you want to count your laps with something you can wear in the pool, check out the best waterproof fitness trackers we've tested.

tracker mqtt iot c-plus-plus arduino esp8266 webserver esp32 gps sms bme280 wemos-d1 gprs sim808 serial-over-http Updated on Jul 12, 2019 C++ ...