July 12, 2007 Heart rate monitors have become an almost ubiquitous tool in fitness training, allowing athletes to ensure they're operating in the right BPM range to maximize the effectiveness of their cardio training or weight loss programs. The chest-strap used to take heart rate readings isn't universally popular though, as many find it uncomfortable and annoying. Adidas tried to solve this by building the sensor into a tight training shirt, NuMetrex built the sensor into a sports bra for women - and now Beurer has come up with a new system that fits as half a glove and reads heart rate from your index finger. The PM 100 beltless heartrate monitor uses photoplethysmography to determine your heart rate - it's effectively a flexible, soft equivalent of the plastic finger clip you get in hospital. While it won't be perfect for sportspeople that need to use their hands, those involved in running or other pure cardio exercise will likely find it a comfortable and no-fuss way to keep a constant tab on their heart rate.