Strapless Heart Rate Monitor Heart Rate Monitor Watch For Swimming?

Heart Rate Monitor Watch for Swimming? - strapless heart rate monitor

I am a very dedicated swimmer and I'm starting my training very seriously. I need a Clock STRAPLESS HRM, you can use the pool to see how hard I work. If I saw a few products, but I'm not sure, maintain or if the product is worth. I have brands like Mio, or see rods. Any help?