At a minimum, consider a body composition scale. These are scales that tell both your weight plus your fat / muscle / bone / water composition. There are (pricey) good ones (registered with the FDA) by Tanita. I got a cheapie (on sale under $20) that probably isn't accurate but that lets me see trends.
Written by Bob Koure
Retired software architect, statistical analyst, hotel mgr, bike racer, distance swimmer. Photographer. Amateur historian. Avid reader. Home cook. Never-FBer