Am I the only person who gets the shivers at the idea of teaching?! I'm very grateful that there are people who don't... Could just about cope with primary kids but NOT the parents! I see DD1's teacher fielding about a million queries every morning, some of which I know (from what the parents have said in the playground) are extremely pissy in tone, and think... it must be a constant struggle not to deck these people on a daily basis - hats off to you all, quite frankly. Or maybe that's just DD1's school.
Lizzy I think the callipers are supposed to be accurate, but maybe it depends on what measurements they take vs where you carry your weight? They measured my bicep, tricep, sub-scapular and whatever the top of my hip is called. All those were OK or just over (sub-scapular they had a real problem getting any fat to measure at all!) because I've got lots of muscle on my upper body, and big hip bones. But you can grab big handfuls of fat on my boobs, bum, thighs, calves and lower back, as I'm enormously pear shaped - think size 14 dress size if it has a flarey skirt, but size 20 jeans size at least, if I bought them which I don't.
I obviously don't have a healthy body fat measurement as I'm 15st and 5' 7" and it's presumably not possible at that BMI (32.8) unless you are a professional rugby player or something. SO probably for somebody like me, they clearly wouldn't present a complete picture without body fat scales or at least more measurements IYSWIM? You probably need to look at everything together - body fat scales, callipers, BMI, dress size and the mirror! But you and Tea must be whippets with your machine-like ways so perhaps this would be less of a problem.