Universal Wireless Heart Rate Data Logger with PC Download by Oregon Scientific
The device works reliably after replacement of battery although the instructions are easy to ignore. They didn't survive translation for me. It will log up to 30 hours with a variable interval for data collection making even longer tracking possible. Others have noted that the data can be exported to a CVS file for other uses. Kubios accepts such files but whether the data granularity would be acceptable is the issue.
Fine display of the printable data:
The 150 BPM is my exercise period followed by a cool down and three separate trips up and down 10 flights of stairs to deal with keys and locking myself out.of my apartment.