Trevor Wilson said:
Body fat analysis scales
Jaycar P# QM7249 On special for $110.00.
Mine arrived yesterday. Bloody rip-snorter. Nicely made and finished and the
thing works well.
I thought I could fool it, by standing on it with wet feet. Nope. It seems
to have several sensors which compensate for skin resistance. Kinda like
4-wire resistance analysis. Very impressive stuff. The last time I tried
some of these scales out, they cost 500 Bucks.
OK I just picked one up today.
Trevor, would your bodyfat reading happen to be in the 23-24% range?
The scale is reminiscent of the handheld fat monitor that I tried a few
months back. No matter who uses it, it'll return a figure around 23-24% -
even if I shorted the two probes! It said my obviously skinny friends
were overweight, haha..
I did the same with this scale - I placed an aluminium flat across it and
measured the resistance between the left and right "sensors" (the three
tracks are connected to each other) to confirm that the sensors were being
shorted. Did the fat test, and surprise, 23.1%.
I squatted on the scale in such a way that my feet didn't touch the sensors,
and lightly placed my fingers on the sensors hoping to stuff up the
reading. I got 22.8%.
What sort of figures am I meant to get if I short the sensors? I assumed it
should cause an error.
I'm gonna try it with my skinny friend today. I have a feeling I'll get the
same problem as the handheld one... probably gonna return it tomorrow!
Weight-wise, it does seem to fluctuate a bit. A Tanita (they seem to be the
standard in bodyfat scales, and they're also known for accurate weight
readings) says I'm 67.2kg. The Jaycar one I tried at the store also said
67.2kg, but the one I brought back says 66.1 to 66.5kg. The tanita says 8%
body fat, the jaycar one says 23%. Both scales were used within two hours
of each other, on flat ground.