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Is that the case with all body composition scales? If so, then I should try to be less narked about it. There is no way I could manage to drink the same amount and weigh at the same time.
Just need to figure out why Garmin thinks my bones have been getting lighter over the last few years :D
Stonehedge-
So far as I know, all bioimpedence scales are roughly the same.
If you're serious about BF% you'd get a proper measurement done in a float tank or bodpod/DEXA and then convert it over to what your scale says, but that still won't eliminate the bioimpedence error with hydration status.
From Tanita FAQ:
When is the best time to use my body composition monitor?
Your body water levels naturally fluctuate throughout the day and night. Any significant changes in body water may affect your body composition readings; for example, the body tends to be dehydrated after a long night sleep so if you take a reading first thing in the morning your weight will be lower and your body fat percentage higher. Eating large meals, drinking alcohol, menstruation, illness, exercising, and bathing may also cause variations in your hydration levels. To get the most reliable reading it is important to use your Body Composition Monitor at a consistent time of day under consistent conditions. We suggest taking a reading before your evening meal."The results obtained through Tanita BIA have been shown to be within +/-5% of Underwater Weighing and DEXA (the "gold" standards of body composition analysis.)"
hippy
My body fat % will vary 4%-7% during the day. I just put it down to hydration/dehydration.
To even it out you're supposed to drink some amount and then weigh an hour later or something. I haven't got time fort that so I just note the numbers and move on with sinking piss and eating kebabs.