So you want to monitor your swimming workouts more closely? The Garmin HRM-Swim can help. It is a smart wearable device that stores up to 20 hours of heart rate data during swims and lets you access the data on your smart device. It has a compact and durable design. The device is designed to withstand exposure to salt and fresh water. The battery life lasts up to 18 months.
The device has a water rating of 5 ATM. It helps you keep a closer eye on your workout sessions. You can get yours under $100.