I'm currently considering getting a body fat scale that uses electrical impedance for my home. I understand about how body fat scales are a better measure of progress between measurements than absolute measurements, and how one needs to measure with consistent conditions for meaningful comparisons. I've been using a body fat scale at my gym for years.
I've noticed that while prices vary widely, there are essentially three levels of price. The very low end ones you just stand on, and have simple LCD displays. Next up from that are the ones that have a retractable handle to hold onto so that the electrical signal goes through your arms as well as your legs. The third level is for a full stand unit, with large video screens and the ability to connect to printers and other peripherals. There are also some other features that can be found at any level, like Bluetooth connectivity to one's phone.
At their core, if you strip away the screens and peripherals, they're all essentially the same thing: a set of electrically conductive pads along with a chip for measuring the electrical signals transmitted through one's body.
From that perspective, is there any reason to believe that these devices get meaningfully better as you go up in price? Or are you just paying for the housing and fancy screens? Is there anything about the strength of signal or the quality of the conductive surfaces that would be important in terms of quality?
It seems to me that it would be good to get a unit with hand sensors as well, but beyond that, is there anything else about one of these devices that I should be looking for in order to get the most accuracy?