The Lemfo NY12 is a budget smartwatch that features not only IP certification, but also heart rate and blood pressure monitoring. The Lemfo NY12 is available in two colours and with a choice of four watch straps.
https://www.notebookcheck.net/Lemfo-NY12-An-affordable-smartwatch-with-IP-certification-a-heart-rate-monitor-and-a-blood-pressure-sensor.469630.0.html