First, thanks for all the insightful comments to my last post. I'm still not sure if 36 hrs is enough, but the general consensus was "listen to your body." Can't go wrong with that!
I've mentioned the desire to monitor my weight and body fat together, rather than weight only. Well, I finally decided on and purchased something for this purpose, the Omron HBF-500, and was able to order it online for under $70 including shipping.
I've had it for about a week now. Here are my thoughts.
I believe the weight is both accurate and consistent. I've stepped on and off the scale and had it return nearly identical readings, better than our other scale. It also returned a number close to the reading from a nurses office earlier in the week when I first got it. And as long as I step on it at the same time each day, I'm getting consistent readings day after day. For that matter, I consistently get a higher reading at night than in the morning. For my own purposes, I've decided that the scale is cranky in the evening and shouldn't be bothered. I now only use it in the morning after it's had a good night's sleep.
The body fat feature is a little tricky at first. It works for up to four users. You have to program in some data before first use and if you want the BF measurement, you have to remember to tell it which user you are before you step on the scale.
I'm not sure how accurate it is, but again, it is consistent. It measures my body fat within a single percentage point each time. It is, giving a reading about 4 percentage points higher than the reading from the nurses office the week I got the scale, but I don't know which reading is more accurate. I figure it doesn't matter if the absolute number is correct. If the scale is consistent, I should be able to tell if I'm making relative progress in the desired direction.
Other features include visceral fat level, skeletal muscle percentage, resting metabolism, and body mass index, but I haven't used any of those at this point.
Overally, I'm pleased. If anyone is considering buying a scale with BF feature, I'd recommend considering this one as you are making your decision.