Those things are totally bogus if it makes you feel any better. Changes in body composition are not reflected properly via bioelectric impedance.
Truth is every bf% measurement is pretty much just a guess with a huge range of error. Far more practical to find some other measurement to track, such as athletic performance (lifting, cardio times) while keeping a loose eye on your weight
Are you saying that digital scales used to measure the weight of a person are inaccurate or am I mixing topics? This is new to me. Why measuring weight should be hard/inaccurate?
And why analogic scales (if they can be called like that) are better?
The other response is correct. Many “smart” scales claim to be able to tell you not only your weight, but also what percentage of your weight is lean mass vs body fat.
They are not accurate in that respect and should never be used
Normal scales that just tell you your weight, whether digital or analogue, are generally correct and reliable
Skin fold calipers, in the best possible case scenario when administered by a trained expert, have such a significant margin of error as to make them functionally useless. I strongly discourage you from lending any credence whatsoever to their measurements when determining your plans regarding training and nutrition.
See my other comment regarding the smart scales, but it's the same situation. They're not "always consistently wrong by the same amount" per individual. If so, then yes, that would be useful for tracking trends. Sadly they are not
The smart scale acts like it can determine your fat and muscle weight. The joke is about not being able to day you have heavy bones because the scale tells you it's all fat.