1.
body composition analyzer; body composition scale
A device that measures body composition — including body fat percentage, muscle mass, bone density, and water content — in addition to weight. More advanced than a standard scale (体重計).
With a body composition analyzer, you can check not just weight but also muscle mass.
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体重計 (bathroom scale)
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ヘルスメーター (health meter)
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体脂肪計 (body fat scale)