It has everything you need in a running watch — an accurate heart rate monitor, a built - in GPS, and support for a ton of different running applications. (androidauthority.com)
The problem is that I've gone through the dungeon several times to verify items and I keep getting more / different / weird items on different runs. (sosostris.com)
In addition, comparing differences across different runs and experiments can identify errors and systemic variations (e.g. noise) and confidence in the experimental results. (rdmag.com)