I have a heart rate monitor (HRM) and a pedometer. I never wore either when I walked with a weighted vest. The HRM needs batteries. I used to just walk for 30 minutes. Actually I do not have a 60lb vest. I have a 40lb and a 20lb. The 20 fits over the 40 if I loosen the straps. Initially I bought them for bodyweight exercises not walking which is why I have two. They are cheap vests I bought from Walmart or Kmart.
My pedometer clips onto my shorts or pants waste ban. I got it for free from my endocrinologist's office. I bought the HRM monitor from a sporting goods store. It fits around my chest and has a wrist watch that displays what my heart rate is. Yes, they are reliable.