MANNOL DIN61 Dispensing Tap for 20L Drum, 5,99 Scubapro Scubapro HRM Belt2. The Scubapro HRM Belt2 is a lightweight, waterproof ECG transmitter that clips onto an elastic chest belt and rests against the skin. It wirelessly transmits your heart rate data and patented skin temperature measurements to compatible dive computers to support a personalized decompression plan for scuba and underwater diving. This compact, low profile belt is designed for comfort and reliability during diving, swimming, or exercising. It weighs about 0. 1 lb and uses a user replaceable CR2032 battery, delivering around 50 dive hours or up to a year of typical use. The unit operates at depths up to 120 meters (394 feet) and is broadly compatible with SCUBAPRO HUD, Galileo 2 and A2 dive computers.