RENPHO Elis 1 Smart Body Scale, black tempered-glass platform with four metal BIA sensors and LED display

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RENPHO Smart Scale (Elis 1)

A Bluetooth bathroom scale that estimates body weight plus 13 body-composition metrics — including BMI, body fat %, body water %, and muscle mass — using bioelectrical impedance analysis (BIA). Readings sync automatically to the RENPHO Health app. RENPHO is an established brand in this category: the Elis 1 is one of its best-selling scales, with a large base of Amazon customer reviews.

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13 body metrics · 4 BIA sensors

Sold at major US retailers,
including Amazon

See current price on Amazon →

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We don't display a fixed price here since Amazon pricing changes — click through to see the current price before buying. RENPHO also sells newer, higher-tier scales (Elis 2X, Elis Nova, and others) with more electrodes and more tracked metrics — make sure the listing you buy is the Elis 1 specifically if that's the model you want.

Governed by the retailer's own return policy at time of purchase

Specs & features

Full technical specifications as published on RENPHO's own product page for the Elis 1 — nothing added, nothing hidden.

Specs & Features

Model: Elis 1Platform: Tempered glass

Specification	Detail
Metrics tracked	13 (weight, BMI, body fat %, body water %, skeletal muscle, fat-free body weight, muscle mass, bone mass, protein, BMR, subcutaneous fat, visceral fat, metabolic age)
Sensors	4 BIA (bioelectrical impedance) electrodes
Max capacity	400 lb / 180 kg
Measurement range	6.6 lb to 400 lb
Display	LED digital display, lb/kg units
Power	3 AAA batteries (included)
Battery life	Up to 4.5 months (manufacturer-stated, typical use)
Connectivity	Bluetooth, RENPHO Health app
App system requirements	iOS 12+ or Android 7.0+
User profiles	Unlimited, with automatic user recognition

Every spec above is as published on RENPHO's own Elis 1 product page. One claim we could partially verify but couldn't fully independently test ourselves: RENPHO's own comparison chart lists the Elis 1 as compatible with Apple Health, Fitbit, Samsung Health, and MyFitnessPal — that's the manufacturer's own stated compatibility, not something we personally confirmed by syncing to each of those apps.

Manufacturer

RENPHO

Country of origin

Not independently confirmed — not disclosed on the Amazon listing

Model

Elis 1

This is a bathroom scale, not a multi-ingredient product — there's no "proprietary blend" to disclose. Every spec above is manufacturer-published; we've flagged the one detail (country of origin/factory) that isn't disclosed on the listing rather than guessing at it.

How it works

What bioelectrical impedance analysis actually measures, and how accurate it really is — not a claim about what this specific unit will do for you.

Bioelectrical impedance analysis (BIA)

When you step on barefoot, the four metal sensors send a low, imperceptible electrical current up through one leg, across the pelvis, and back down through the other leg. Muscle tissue has a high water content and conducts that current easily; fat tissue has lower water content and resists it more. The scale measures how much resistance the current meets, then combines that resistance reading with the height, age, sex, and weight you've entered in the RENPHO app to estimate body fat percentage, muscle mass, water percentage, and the other tracked metrics. This is standard consumer BIA technology, not unique to this scale — the same underlying principle is used across the smart-scale category.

How accurate is it, really?

A peer-reviewed comparison of consumer BIA devices against DEXA and whole-body MRI (Bosy-Westphal et al., Obesity Facts, 2008) found that foot-to-foot BIA scales like this one have noticeably wider margins of error for body-fat percentage than clinical-grade hand-to-foot devices — the study reported 95% limits of agreement as wide as roughly ±14 percentage points of fat mass for some bipolar (foot-only) devices, versus a narrower range for tetrapolar (hand-and-foot) instruments. That study didn't test this specific product, and BIA hardware has improved since 2008, but the underlying physics hasn't changed: a single reading from any foot-only BIA scale is an estimate, not a lab-grade measurement, and it's also sensitive to hydration level, recent food or water intake, and time of day. The more reliable use case is tracking your own trend over weeks — weighing in at a consistent time of day, under similar hydration conditions — rather than treating any single session's body-fat number as exact.

Scientific references

The study below backs the accuracy note above — clickable, so you can read the original source yourself rather than take our summary on faith.

Bosy-Westphal A, Later W, Hitze B, et al. Accuracy of Bioelectrical Impedance Consumer Devices for Measurement of Body Composition in Comparison to Whole Body Magnetic Resonance Imaging and Dual X-Ray Absorptiometry. Obesity Facts. 2008;1(6):319-324. doi:10.1159/000176061. PMC →

Frequently asked questions

Is a home BIA scale as accurate as a doctor's scale?

For total body weight, yes — that measurement is straightforward and reliable on any decent scale. For body-composition metrics like body fat %, no: consumer foot-to-foot BIA scales (this one included) have a wider margin of error than clinical tools like DEXA scans, per the research cited above. They're best used to track your own trend over time under consistent conditions, not as a precise, one-time clinical reading.

Does hydration or time of day affect the reading?

Yes. Because BIA works by measuring electrical resistance through body water, anything that changes your hydration — a workout, a large meal, alcohol, or just the time of day — can shift the body-composition numbers even if your actual body fat hasn't changed. Weighing in at a consistent time (e.g., first thing in the morning) gives more comparable trend data than weighing in randomly.

Do I need the RENPHO app, and does it work with Apple Health or Fitbit?

The app is required to see the 12 body-composition metrics beyond weight — the scale itself only displays a number on its LED screen. RENPHO's own product page lists the Elis 1 as compatible with Apple Health, Fitbit, Samsung Health, and MyFitnessPal; that's the manufacturer's stated compatibility, and we haven't personally tested each integration ourselves.

Can the whole family use one scale?

Yes — per RENPHO, the app supports unlimited user profiles with automatic recognition, so it's built to be shared rather than tied to one person's data.

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These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Results may vary. Consult a healthcare professional before use.