InBody’s approach to accurate measurement starts with electrical impedance readings taken at the hands and feet. The device uses these readings to calculate body composition, giving you more information than body weight alone. Research comparing a professional InBody device with DEXA provides evidence for the model tested; understanding that distinction helps you assess what the results mean for home use. InBody Dial H20 measurement explanation; Hurt et al., 2021.
The InBody Dial is a wellness device, not a medical device.
The InBody Dial models share hand and foot contact, while measurement frequencies, additional results and connectivity differ. Body Balance is available with the InBody Dial H30 and InBody Dial H40. The table compares features, not accuracy rankings.
Source: InBody Europe model comparison, checked 22 September 2026.
| Feature or result | InBody Dial H20 | InBody Dial H30 | InBody Dial H40 |
|---|---|---|---|
| Reads at the hands and feet together | Yes | Yes | Yes |
| Measurement frequencies | 2 | 3 | 3 |
| Skeletal Muscle Mass | Yes | Yes | Yes |
| Percent Body Fat | Yes | Yes | Yes |
| Body Balance | No | Yes | Yes |
| Leg Muscle Level | No | No | Yes |
| Automatic user recognition | No | Yes | Yes |
| Wi-Fi sync | No | Yes | Yes |
The InBody Europe FAQ notes: “Available outputs can vary by market and app version.” Check the current product details when choosing a model. InBody Europe FAQ.
The handle provides hand electrodes that work with the electrodes beneath your feet. The InBody Dial reads at the hands and feet together, making correct contact with the handle and footplate part of the measurement process. Follow the posture and contact instructions for your model. InBody Dial H20 product page.
The InBody Dial uses bioelectrical impedance analysis, or BIA. A small electrical current passes through the body, and the device measures impedance. Those measurements are used to calculate body composition results.
The product page explains: “InBody’s unique technology uses BIA (Bioelectrical Impedance Analysis) to measure body composition.” InBody Dial H20 product page.
Measuring impedance and calculating body composition are connected steps. Describing both steps is more precise than suggesting that every displayed result is measured directly without calculation.
A study by Hurt and colleagues reported good agreement between the professional InBody 770 and DEXA for Fat-Free Mass and Percent Body Fat. The study included 176 healthy adults aged 18 to 65. Participants fasted overnight, and DEXA followed the InBody test within 30 minutes. Hurt et al., 2021.
The concordance correlation coefficients were 0.98 for Fat-Free Mass and 0.97 for Percent Body Fat. For Fat-Free Mass, the average difference was +0.8 kg, calculated as InBody 770 minus DEXA, with reported limits of agreement of −3.5 to +5.2 kg. Hurt et al., 2021.
These findings apply to the InBody 770 and the participants and conditions studied. The research did not test the InBody Dial H20, InBody Dial H30 or InBody Dial H40, so these coefficients are not accuracy scores for the home models.
An agreement coefficient, an average difference and limits of agreement answer different questions. Reading these measures together helps explain how closely methods agree and how much individual readings can differ. A coefficient should not be converted into a percentage accuracy claim. Lin, 1989; Bland and Altman, 1999.
Before applying a research finding, check the device, the result assessed and the study population. Agreement with DEXA on one result does not validate every result displayed by every InBody model.
The home range provides Weight, Skeletal Muscle Mass, Percent Body Fat, Basal Metabolic Rate and Visceral Fat Level, among other results. The InBody Dial H30 and InBody Dial H40 also provide Body Balance, and the InBody Dial H40 provides Leg Muscle Level. InBody Europe model comparison.
These results let you review more than a change in body weight. Keep the result names distinct when reviewing your record: Skeletal Muscle Mass and Percent Body Fat describe different aspects of body composition, while Body Balance is a separate result.
The distinction also matters when reading research. Fat-Free Mass includes more than skeletal muscle and is not interchangeable with Skeletal Muscle Mass. The research findings above should therefore remain labelled Fat-Free Mass, rather than being presented as validation of Skeletal Muscle Mass.
Follow a consistent testing routine and your model’s instructions. InBody Europe recommends a similar time of day, testing before eating or exercising, using the toilet beforehand and placing the device on a hard, level surface. InBody Europe FAQ.
Use the same device for your ongoing record, and consider several readings taken under similar conditions. When comparing records, note whether the device or testing routine changed. Keeping home and professional-device records separate makes those differences easier to recognise. A difference between readings should prompt a check of the measurement conditions before being interpreted as a change in body composition.
The InBody Dial measures electrical impedance and uses those measurements to calculate body composition results. The hand and foot electrodes are part of that measurement process. InBody Dial H20 product page.
Body Balance is listed for the InBody Dial H30 and InBody Dial H40, but not the InBody Dial H20. See Which InBody Is Right for Me? for the model comparison.
Body composition readings can vary with your condition and the circumstances of the test. Follow a consistent routine when comparing readings. InBody Europe FAQ.
The cited study’s numerical findings apply to the InBody 770, not to the InBody Dial H20, InBody Dial H30 or InBody Dial H40. Evidence for a specific device and result should be identified before making an accuracy claim about that combination. Hurt et al., 2021.
Place the device on a hard, level surface, tap the footplate and wait for 0.0 before stepping on. Carpet or uneven flooring can affect the reading. InBody Europe FAQ.
Written by the InBody Home team. Last reviewed: 22 September 2026.
The InBody Dial is a wellness device, not a medical device. The InBody Dial is not intended to diagnose, treat or monitor a medical condition. This article is not medical advice. Talk to a healthcare professional about health decisions.
Cuando el peso baja rápidamente, la báscula te dice cuánto has perdido, no qué has perdido. Para ver la diferencia, sigue el Percent Body Fat y la Skeletal Muscle Mass una vez por semana desde la primera semana, con una báscula que mide en las manos y los pies. En una pérdida de peso rápida, la mayor parte de lo perdido es grasa, pero una proporción medible es músculo, y esa proporción cambia sobre todo en las primeras cuatro semanas.
InBody makes three home body composition scales: the Dial H20, H30 and H40. All three read at the hands and the feet, not the feet alone. If wellness is becoming part of your everyday, the H20. If sport is already part of your week, the H30. If fitness runs in your household, the H40.
